| **EMPLOYMENT AGREEMENTS: (Details) (USD $)**                                                                  | 3 Months Ended |         | 3 Months Ended | 0 Months Ended |        | 0 Months Ended | 3 Months Ended |
|---------------------------------------------------------------------------------------------------------------|----------------|---------|----------------|----------------|--------|----------------|----------------|
||
| **Stock-Based Compensation**                                                                                  |           |    |           |           |   |           |           |   |   |   |   |   |   |   |   |   |
| Salary continuance, period                                                                                    | 1 year         |    |           |           |   |           |           |   |   |   |   |   |   |   |   |   |
| Lump sum payment of salary, (in percent)                                                                      |           |    |           |           |   |           |           |   |   |   |   |   |   |   |   | 150.00% |
| Officers' Compensation                                                                                        |           |    |           | $ 215,000      |   |           |           |   |   |   |   | $ 210,000 |   |   |   |   |
| Expected Bonus Based on Performance, Percentage                                                               |           |    |           | 50.00%         |   |           |           |   |   |   |   | 50.00% |   |   |   |   |
| Percentage Adjustment to Target Bonus for Every One Percent Variance Between Targets and Actual Results       |           |    |           | 2.00%          |   |           |           |   |   |   |   | 2.00% |   |   |   |   |
| Minimum Percentage of Results for Bonus Payment                                                               |           |    |           | 90.00%         |   |           |           |   |   |   |   | 90.00% |   |   |   |   |
| Maximum Bonus Percentage                                                                                      |           |    |           | 70.00%         |   |           |           |   |   |   |   | 70.00% |   |   |   |   |
| Granted (in shares)                                                                                           |           |    | 605,000        |           | 75,000 |           | 75,000         | 75,000 | 37,500 | 37,500 |   |   | 100,000 | 50,000 | 50,000 |   |
| Period for which options are exercisable                                                                      |           |    |           |           |   | 10 years       |           |   |   | 10 years |   |   |   |   |   |   |
| Annual Increase in Salary Based on Performance, Percentage                                                    |           |    |           | 5.00%          |   |           |           |   |   |   |   |   |   |   |   |   |
| Share price, Stock price required for options to vest                                                         |           | $ 1.395 |           |           |   |           |           |   |   |   | $ 3.00 |   |   |   |   |   |
| Number of consecutive days considered for common stock price per share to determine vesting of options (days) |           |    |           |           |   |           |           |   |   | 10 days |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Deferred Compensation Arrangement with Individual, Expected Bonus Based on Performance, Percentage
+ References
No definition available.
+ Details**Name:**dlhc_DeferredCompensationArrangementwithIndividualExpectedBonusBasedonPerformancePercentage**Namespace Prefix:**dlhc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Employment Agreement, Annual Base Salary, Annual Increase in Salary Based on Performance, Percent
+ References
No definition available.
+ Details**Name:**dlhc_EmploymentAgreementAnnualBaseSalaryAnnualIncreaseinSalaryBasedonPerformance**Namespace Prefix:**dlhc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Employment Agreement, Maximum Bonus Percentage
+ References
No definition available.
+ Details**Name:**dlhc_EmploymentAgreementMaximumBonusPercentage**Namespace Prefix:**dlhc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Employment Agreement, Minimum Percentage of Results for Bonus Payment
+ References
No definition available.
+ Details**Name:**dlhc_EmploymentAgreementMinimumPercentageofResultsforBonusPayment**Namespace Prefix:**dlhc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Employment Agreement, Percentage Adjustment to Target Bonus for Every One Percent Variance Between Targets and Actual Results
+ References
No definition available.
+ Details**Name:**dlhc_EmploymentAgreementPercentageAdjustmenttoTargetBonusforEveryOnePercentVarianceBetweenTargetsandActualResults**Namespace Prefix:**dlhc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period
+ References
No definition available.
+ Details**Name:**dlhc_SharebasedCompensationArrangementbySharebasedPaymentAwardExpirationPeriod**Namespace Prefix:**dlhc_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the period considered for common stock price per share to determine vesting of awards.
+ References
No definition available.
+ Details**Name:**dlhc_ShareBasedCompensationArrangementByShareBasedPaymentPeriodConsideredForCommonStockPricePerShareForAwardsVesting**Namespace Prefix:**dlhc_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Supplemental Unemployment Benefits, Salary Continuation, Percentage of Salary
+ References
No definition available.
+ Details**Name:**dlhc_SupplementalUnemploymentBenefitsSalaryContinuationPercentageofSalary**Namespace Prefix:**dlhc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Supplemental Unemployment Benefits, Salary Continuation, Period
+ References
No definition available.
+ Details**Name:**dlhc_SupplementalUnemploymentBenefitsSalaryContinuationPeriod**Namespace Prefix:**dlhc_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expenditures for salaries of officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688
+ Details**Name:**us-gaap_OfficersCompensation**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Gross number of share options (or share units) granted during the period.
+ References
No definition available.
+ Details**Name:**us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Price of a single share of a number of saleable stocks of a company.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258
+ Details**Name:**us-gaap_SharePrice**Namespace Prefix:**us-gaap_**Data Type:**num:perShareItemType**Balance Type:**na**Period Type:**instant |