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Stock Compensation Plans: Narrative (Details) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Jan. 28, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 215,530 306,240 369,150 421,925  
Aggregate intrinsic value of options exercised $ 768,000 $ 655,000 $ 632,000    
Share-based compensation, nonvested awards, future recognition of compensation cost, Stock Options $ 255,000        
Unrecognized compensation cost, weighted average period for recognition (in years) 1 year 4 months 2 days        
2014 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 124,530        
Options vested (in shares) 111,930        
Options unvested (in shares) 12,600        
Equity Incentive Plan 2019          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares)         350,000
Number of shares available for grant (in shares) 129,855        
Options outstanding (in shares) 161,450        
Options vested (in shares) 68,300        
Options unvested (in shares) 93,150        
Equity Incentive Plan 2019 | Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares)         300,000
Equity Incentive Plan 2019 | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares)         50,000
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years) 5 years        
Stock options granted during period (in shares) 0 0 1,000    
Stock options, aggregate grant date fair value     $ 9,000    
Stock options vested during period (in shares) 34,930 43,690 59,990    
Stock options vested during period, aggregate grant date fair value $ 191,000 $ 235,000 $ 316,000    
Number of unvested stock options (in shares) 35,300 77,230      
Unvested stock awards, aggregate grant date fair value $ 235,000 $ 468,000      
Unvested stock options, aggregate intrinsic value 196,000        
Stock options, outstanding, aggregate intrinsic value 1,523,000 1,599,000 $ 1,518,000    
Share-based payment expense $ 192,000 $ 233,000      
Stock Options | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years) 3 years        
Stock Options | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years) 5 years        
MRDP Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period (in years) 10 years        
Number of unvested stock awards (in shares) 70,450 49,015 26,150 0  
Stock awards, granted during period (in shares) 35,350 28,815 26,150    
Unvested restricted stock $ 2,271,000        
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost, weighted average period for recognition (in years) 2 years 6 months 18 days        
Share-based payment expense $ 345,000 $ 157,000