| **Note 6 - Product Warranty**                 | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| **Product Warranties Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Product Warranty Disclosure [Text Block]      | **6.**

**PRODUCT WARRANTY**

The Company provides product warranties for its various products, typically for one year. Liabilities for the estimated future costs of repair or replacement are established and charged to cost of sales at the time the sale is recognized. The Company established its reserve based on historical data, taking into consideration specific product information. The following table sets forth the changes in the warranty reserve (in thousands):
** **** **
**Three Months**
** **** **** **
**Ended March 31,**
** **** **** **
**2014**
** **** **
**2013**
** **
Balance at beginning of period
                             $                  118                                                        $                  50                           
Provisions
                                                113                                                                           29                           
Warranty services provided, net
                                                (63                  )                                                        (24                  )                                                        $                  168                                                        $                  55                    |

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| - Definition
The entire disclosure for standard and extended product warranties and other product guarantee contracts, including a tabular reconciliation of the changes in the guarantor's aggregate product warranty liability for the reporting period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249
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