Quarterly report [Sections 13 or 15(d)]

Note 8 - Stock-based Incentive Plans (Details Textual)

v3.25.3
Note 8 - Stock-based Incentive Plans (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Apr. 01, 2025
Feb. 07, 2023
Mar. 15, 2021
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Restricted Stock [Member]              
Share-Based Payment Arrangement, Expense       $ 35,000 $ 34,000 $ 103,000 $ 109,000
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount       $ 29,000   $ 29,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 months 12 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)           21,534  
Equity Incentive Plan 2016 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       2,500,000   2,500,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       1,129,047   1,129,047  
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 Payment Arrangement, Expense         $ 181,000 $ 0 $ 362,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 223,307 212,937          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month) 2 years            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Payment Per Share (in dollars per share) $ 12 $ 12          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)           186,320  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)           26,617  
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 (Month)   3 months          
The Phantom Plan [Member] | Phantom Shares [Member] | Employees and Non-Employee Directors [Member] | Vesting Per Quarter [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 12.50%            
The Phantom Plan [Member] | Phantom Shares [Member] | Employees and Non-Employee Directors [Member] | Financial Results Based Award Vesting [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 6.25%            
Share-Based Compensation Arrangement by Share-Based Payment Award, Minimum Amount of Operating Profit Needed to Meet Service Condition $ 150,000            
The Phantom Plan [Member] | Phantom Shares [Member] | Employees and Non-Employee Directors [Member] | Stock Appreciation Based Award Vesting [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 6.25%            
Share-Based Compensation Arrangement by Share-Based Payment Award, Minimum Amount of Operating Profit Needed to Meet Service Condition $ 150,000            
Share-Based Compensation Arrangement by Share-Based Payment Award, Additional Financial Performance Condition Needed for Vesting Award $ 300,000