| **SHAREHOLDERS' EQUITY: (Details) (USD $)**                                  | 12 Months Ended | 0 Months Ended |             |             |           | 0 Months Ended |
|------------------------------------------------------------------------------|-----------------|----------------|-------------|-------------|-----------|----------------|
||
| Value of shares that can be purchased under non-transferable rights          |            |           |        | $ 4,200,000 |      |           |   |   |
| Number of shares entitled by holder under each subscription right            |            |           |        | 0.532       |      |           |   |   |
| Common stock price under subscription right                                  |            |           |        | $ 1.30      |      |           |   |   |
| Common stock owned by Wynnefield Capital (as a percent)                      |            |           |        |        |      |           |   | 21.00% |
| Proceeds from rights offering                                                | $ 0             | $ 4,197,000    | $ 4,200,000 |        |      |           |   |   |
| Number of shares issued as rights                                            |            |           | 3,230,769   |        |      |           |   |   |
| Shares outstanding                                                           | 9,318,000       | 9,266,000      | 9,265,702   |        | 9,318,000 | 9,266,000      | 6,021,000 |   |
| Issuance of number of shares to officers and directors under Rights Offering |            |           | 137,678     |        |      |           |   |   |
| Issuance of number of shares to entities affiliated to Wynnefield Capital    |            |           | 2,840,251   |        |      |           |   |   |

| X                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the price per share fixed and payable by the holder under subscription right.
+ References
No definition available.
+ Details**Name:**dlhc_CommonStockPriceUnderSubscriptionRight**Namespace Prefix:**dlhc_**Data Type:**num:perShareItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the value of shares that can be purchased under non-transferable rights.
+ References
No definition available.
+ Details**Name:**dlhc_NonTransferableRightValueOfSharesThatCanBePurchased**Namespace Prefix:**dlhc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the ratio applied to determine the number of shares the holder may purchase for each subscription right.
+ References
No definition available.
+ Details**Name:**dlhc_NumberofCommonStockEntitledbyHolderUnderEachSubscriptionRight**Namespace Prefix:**dlhc_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the percentage of common stock owned by third party through certain affiliated entities prior to the rights offering.
+ References
No definition available.
+ Details**Name:**dlhc_PercentageOfCommonStockOwnedByThirdPartyPriorToRightsOffering**Namespace Prefix:**dlhc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents cash inflow from the additional capital contribution to the entity by the existing shareholders in respect to right given by entity.
+ References
No definition available.
+ Details**Name:**dlhc_ProceedsFromIssuanceOfRightShare**Namespace Prefix:**dlhc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the number of new stock issued as rights offering during the period.
+ References
No definition available.
+ Details**Name:**dlhc_StockIssuedDuringPeriodSharesRightOffering**Namespace Prefix:**dlhc_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the number of shares issued to officers and directors under Rights Offering during the period.
+ References
No definition available.
+ Details**Name:**dlhc_StockIssuedDuringPeriodSharesRightsOfferingToOfficersAndDirectors**Namespace Prefix:**dlhc_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the number of shares issued under rights offering to related parties.
+ References
No definition available.
+ Details**Name:**dlhc_StockIssuedDuringPeriodSharesRightsOfferingToRelatedParties**Namespace Prefix:**dlhc_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5
+ Details**Name:**us-gaap_CommonStockSharesOutstanding**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |