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Note 19 - Equity Incentive Plan (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2016
Apr. 30, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 153,443        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 44.49        
Deferred Compensation Liability, Current and Noncurrent, Total $ 1,742,000 $ 1,786,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 14.92 $ 13.43 $ 14.41    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 1,477,000        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years 8 months 12 days        
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) 131,148        
Share-based Compensation Arrangement by Share-based Payment Award, Instruments Other Than Options, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 42.80        
Stock Appreciation Rights (SARs) [Member] | Other Liabilities [Member]          
Deferred Compensation Liability, Current and Noncurrent, Total $ 2,303,000 $ 1,587,000      
Options and Stock Appreciation Rights [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Intrinsic Value of Awards Exercised During Period $ 463,000 $ 369,000 $ 200,000    
The 2009 Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)         100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 12,436        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 33.99        
The 2016 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       750,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 141,007        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 45.41        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 430,271        
The 2016 Equity Incentive Plan [Member] | Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) 131,148        
Share-based Compensation Arrangement by Share-based Payment Award, Instruments Other Than Options, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 42.80