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Note 11 - Share-based Compensation (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 5,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 2,125,120    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 4,500 $ 1,200 $ 800
Proceeds from Stock Options Exercised 2,703 1,927 283
Share-based Payment Arrangement, Exercise of Option, Tax Benefit 900 200 100
Share-based Payment Arrangement, Option [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 900    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 2 months 12 days    
Stock Appreciation Rights (SARs) [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 800 300 $ 0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year    
Employee Service Share-based Compensation, Tax Benefit from Exercise of Equity Instruments Other than Options $ 100 $ 100  
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 200    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 3 years    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 6,100    
Restricted Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 5 years    
Performance Shares [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 4 years 1 month 6 days    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 2,600    
Performance Shares [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 5 years    
Performance Shares [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Common Stock [Member]      
Shares Received from Stock Options Exercised (in shares) 17,365 13,237 12,450
Stock Issued During Period, Shares, New Issues (in shares) 24,591 19,232 33,172
Outside Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years