v3.26.1
Note 3 - Stock-Based Compensation and Shareholders' Equity (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2026
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated share-based compensation expense   $ 69,000   $ 30,000    
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized $ 728,000          
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 30 months          
Unrecognized ompensation cost related to share-based compensation on restricted stock awards $ 467,000          
Share-based compensation arrangement by share-based payment award, options, grants in period, gross 37,000   68,975      
Share-based compensation arrangement by share-based payment award, options, outstanding, number 186,445   181,875   176,145 137,275
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value $ 7.17   $ 6.64      
Non-Employee [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, number of shares authorized 50,000          
Share-based compensation arrangement by share-based payment award, shares issued 10,884          
Stock repurchase program remaining number of shares 39,116          
Annual stock based compensation service fee $ 8,000          
Increased annual stock based compensation service fee $ 19,230          
The 2015 Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, number of shares authorized 300,000          
Share-based compensation arrangement by share-based payment award, options, outstanding, number 149,445          
The 2025 Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, number of shares authorized 500,000          
Shares available for future grants 450,000          
Employee Stock Purchase Plan 2021 [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated share-based compensation expense $ 0   $ 0      
Share-based compensation arrangement by share-based payment award, number of shares authorized 30,000          
Share-based compensation arrangement by share-based payment award, shares issued 3,319          
Discount rate on common stock 10.00%          
Expiration date May 31, 2026          
Director Compensation Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated share-based compensation expense $ 48,000   $ 43,000      
Employee Stock Option [Member] | The 2015 Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, period options can be exercised after grant date 6 months          
Employee Stock Option [Member] | The 2015 Plan [Member] | First Anniversary [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage 20.00%          
Employee Stock Option [Member] | The 2025 Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, options, grants in period, gross 50,000          
Share-based compensation arrangement by share-based payment award, options, outstanding, number 50,000          
Restricted Stock [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 19 months          
Restricted Stock Awards Granted 13,000