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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 23, 2017
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Share-Based Payment Arrangement, Expense   $ 1.1 $ 1.1    
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)   32,068 31,383    
Performance Shares [Member]          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 2.4      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 3 months 18 days      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Expected toVested (in shares)   164,231      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Expected to Vest, Performance Obligations Exceeded (in shares)   233,087      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   116,192      
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   63,839      
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)   52,353 22,350    
Restricted Stock [Member]          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 1.4      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         1 year 7 months 6 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       24,445  
Restricted Stock Units (RSUs) [Member]          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 3.1      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 9 months 18 days      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   70,669      
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   38,601      
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)   32,068      
The 2017 Equity Compensation 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, Number of Shares Available for Grant (in shares)   59,209      
The 2017 Equity Compensation Plan [Member] | Restricted Stock, Options and Restricted Stock Units [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years        
The 2017 Equity Compensation Plan [Member] | Restricted Stock, Options and Restricted Stock Units [Member] | Vesting Each Year [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 33.33%        
The 2017 Equity Compensation Plan [Member] | Share-Based Payment Arrangement, Option [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) 10 years        
The 2017 Equity Compensation Plan [Member] | Performance Shares [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years