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Note 6 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 10, 2020
Feb. 24, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Share Price (in dollars per share) $ 43.95              
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total     $ 562 $ 537 $ 402 $ 294    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     4,000       $ 4,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             3 years 9 months  
The 2003 Incentive Plan [Member] | Chairman Chief Executive Officer and President [Member] | Common Stock [Member]                
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total   $ 400            
Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 14,892              
Share-based Payment Arrangement [Member]                
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     $ 205   $ 188   $ 553 $ 348
Employee and Nonemployee Stock Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)             14,892  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value             $ 757 628
Proceeds from Stock Options Exercised             $ 474 $ 440
Restricted Stock Units (RSUs) [Member]                
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)             11,233 8,132
Shares Paid for Tax Withholding for Share Based Compensation Market Price (in dollars per share)             $ 49.98 $ 33.35