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Note 10 - Incentive Plans (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended 21 Months Ended
Mar. 31, 2020
Nov. 30, 2010
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     49,000 42,300    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)     13,400 14,133    
Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Expense     $ 111 $ 68    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 400   $ 400  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     3 years 6 months      
Equity Appreciation Right Units [Member]            
Share-based Payment Arrangement, Expense     $ 143 $ 108    
Stock Incentive Plan 2017 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)           350,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 50,000       175,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     49,000 42,300    
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    
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