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Note 9 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 797,294   814,544
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 186,000    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 186,000 $ 7,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 803,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 146 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 0 $ 88,000  
Employee Stock Option [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award Options Exercise Period 7 years    
Employee Stock Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award Options Exercise Period 10 years    
2015 Employee Stock Purchase Plan [Member]      
Employee Stock Purchase Plans, Offering Period 180 days    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 15.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 50,000    
Stock Issued During Period, Shares, Employee Stock Purchase Plans     3,585
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     46,415
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 2.35
Stock Incentive Plan 2015 [Member]      
Common Stock, Capital Shares Reserved for Future Issuance 165,800    
Stock Incentive Plan 2006 and 2015 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 797,294