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Note 9 - Incentive Plans (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2010
Dec. 31, 2020
Dec. 31, 2019
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   42,300 186,200  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)   14,133 2,250  
Share-based Payment Arrangement, Option [Member]        
Share-based Payment Arrangement, Expense   $ 68 $ 268  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 335    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 146 days    
Equity Appreciation Right Units [Member]        
Share-based Payment Arrangement, Expense   $ 108 $ 0  
Stock Incentive Plan 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   42,300 186,200  
Equity Appreciation Rights Plan 2010 [Member] | Equity Appreciation Right Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Redemption Cash Payment Period (Day) 90 days      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in shares)   0 100,000  
Equity Appreciation Rights Plan 2010 [Member] | Equity Appreciation Right Units [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 1,000,000