Annual report pursuant to Section 13 and 15(d)

Note 1 - Summary of Significant Accounting Policies (Details Textual)

v3.24.3
Note 1 - Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
shares
Apr. 30, 2024
USD ($)
Nov. 07, 2023
USD ($)
Accounts Receivable, Allowance for Credit Loss, Current   $ 79,000 $ 79,000    
Depreciation $ 5,815,000 4,915,000 2,647,000    
Goodwill, Impairment Loss $ 0 0 0    
Number of Patents Granted 53        
Amortization of Intangible Assets $ 1,567,000 1,128,000 766,000    
Impairment, Long-Lived Asset, Held-for-Use 0 0 $ 0    
Unrecognized Tax Benefits $ 0 $ 0      
Stock Repurchased During Period, Shares | shares 15,879 12,862 13,292    
Common Stock, Shares Authorized | shares 50,000,000 50,000,000      
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.01 $ 0.01      
Preferred Stock, Shares Authorized | shares 500,000 500,000      
Research and Development Expense $ 3,000,000 $ 3,115,000 $ 895,000    
Advertising Expense $ 535,000 $ 609,000 $ 537,000    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares 0 0 0    
Undesignated Shares [Member]          
Preferred Stock, Shares Authorized | shares 5,000,000        
Series B Preferred Stock [Member]          
Preferred Stock, Shares Authorized | shares 500,000        
Stock Repurchase Program [Member]          
Share Repurchase Program, Authorized, Amount $ 65,000,000     $ 25,000,000 $ 18,000,000
Stock Repurchased During Period, Shares | shares 1,164,190        
Stock Repurchased During Period, Value $ 33,058,000        
Stock Repurchased, Cumulative | shares 1,729,780        
Stock Repurchased, Value, Cumulative $ 40,077,000        
Share Repurchase Program, Remaining Authorized, Amount $ 24,923,000