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Note 8 - Stock-based Incentive Plans (Details Textual) - USD ($)
3 Months Ended
Feb. 07, 2023
Feb. 06, 2023
May 14, 2021
Mar. 15, 2021
Mar. 31, 2023
Mar. 31, 2022
Restricted Stock [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   97,900     97,900  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)   3 years        
Share-Based Payment Arrangement, Expense         $ 46,000  
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 427,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         1 year 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         8,162  
Equity Incentive Plan 2016 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)           2,500,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)           1,121,683
The Phantom Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years    
The Phantom Plan [Member] | Phantom Shares [Member] | Employees and Non-Employee Directors [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 212,937     223,307    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years    
Share-Based Payment Arrangement, Expense         $ 127,000 $ 196,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Payment Per Share (in dollars per share) $ 12.00          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         26,617 27,913
The Phantom Plan [Member] | Phantom Shares [Member] | Employees and Non-Employee Directors [Member] | Vesting Increments [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years          
The Phantom Plan [Member] | Phantom Shares [Member] | Employees and Non-Employee Directors [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Payment Per Share (in dollars per share)       $ 12.00    
The Phantom Plan [Member] | Phantom Shares [Member] | NewNonEmployeeDirectorsMember            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     9,074      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)     9,074