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Note 9 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
May. 27, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stock Incentive Plan 2006 and 2015 [Member]          
Common Stock, Capital Shares Reserved for Future Issuance   545,614   545,614  
Stock Incentive Plan 2006 and Stock Option Plan 1998 [Member]          
Common Stock, Capital Shares Reserved for Future Issuance   686,585   686,585  
Two Thousand Fifteen Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 50,000        
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%        
Employee Stock Option [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Contractual Term       7 years  
Employee Stock Option [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Contractual Term       10 years  
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 6,000 $ 68,000 $ 189,000 $ 404,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   521,000   $ 521,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 3 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   $ 88,000 $ 77,000 $ 264,000 $ 230,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   15,300   15,300