Quarterly report [Sections 13 or 15(d)]

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

v3.26.1
Note 8 - Stock-based Incentive Plans (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Apr. 01, 2025
Mar. 15, 2021
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Restricted Stock [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares)     0   0
Share-Based Payment Arrangement, Expense     $ 34,000    
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     $ 0 $ 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 223,307        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 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        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)         111,652
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)     111,655   111,655
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