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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended
May 23, 2017
Mar. 31, 2024
Mar. 31, 2023
Share-Based Payment Arrangement, Expense   $ 1.0 $ 1.1
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)   33,604 32,068
Performance Shares [Member]      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 3.0  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 2 months 12 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Expected toVested (in shares)   181,847  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Expected to Vest, Performance Obligations Exceeded (in shares)   302,196  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   53,041  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   28,971  
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)   24,070 52,353
Restricted Stock [Member]      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 1.1  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 8 months 12 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   32,764  
Restricted Stock Units (RSUs) [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)   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)   73,013  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   39,409  
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)   33,604  
The 2017 Equity Compensation Plan [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 1,200,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   373,848  
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