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Note 3 - Stock-Based Compensation (Details Textual) - USD ($)
xbrli-pure in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   0 810,000  
Allocated Share-based Compensation Expense   $ 163,000 $ 34,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   1,005,000   1,065,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   0.00%    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 640,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 335 days    
Accounting Standards Update 2016-09 [Member] | Additional Paid-in Capital [Member]        
Current Period Reclassification Adjustment $ (866,000)      
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]        
Current Period Reclassification Adjustment $ 866,000