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Note 9 - Share-based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
May. 27, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Stock Incentive Plan 2006 and 2015 [Member]            
Note 9 - Share-based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)   559,914   559,914    
2015 Employee Stock Purchase Plan [Member]            
Note 9 - Share-based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 50,000          
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%          
Employee Stock Option [Member]            
Note 9 - Share-based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)   674,260   674,260   722,675
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Contractual Term       7 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 42,000 $ 108,000 $ 183,000 $ 336,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   640,000   $ 640,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 36 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   $ 88,000 $ 77,000 $ 176,000 $ 154,000  
Employee Stock Option [Member] | Stock Incentive Plan 2006 and Stock Option Plan 1998 [Member]            
Note 9 - Share-based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)   674,260   674,260