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Note 5 - Share-Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation   $ 167  
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total $ 294 237  
Common Stock [Member]      
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation    
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total  
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (8,000) (5,000)  
The 2003 Incentive Plan [Member] | Chairman Chief Executive Officer and President [Member] | Common Stock [Member] | Forecast [Member]      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total     $ 400
Share-based Payment Arrangement [Member]      
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation $ 164 $ 156  
Employee and Nonemployee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 274 514  
Proceeds from Stock Options Exercised $ 285 $ 367  
Restricted Stock Units (RSUs) [Member]      
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 8,132 5,238  
Shares Paid for Tax Withholding for Share Based Compensation Market Price $ 33.35 $ 27.60  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 3,100    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 4 years