Annual report pursuant to Section 13 and 15(d)

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

v3.23.3
Note 1 - Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended
Jan. 27, 2022
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Nov. 07, 2023
USD ($)
Apr. 25, 2017
USD ($)
Depreciation   $ 4,915,000 $ 2,647,000 $ 1,699,000    
Goodwill, Impairment Loss   $ 0 0 0    
Number of Patents Granted   47        
Amortization of Intangible Assets   $ 1,128,000 766,000 602,000    
Impairment, Long-Lived Asset, Held-for-Use   0 0 $ 0    
Unrecognized Tax Benefits, Ending Balance   0 0      
Stock Repurchase Program, Increase in Authorized Amount $ 10,000,000          
Stock Repurchase Program, Authorized Amount $ 22,000,000 $ 22,000,000 $ 22,000,000     $ 12,000,000
Stock Repurchased, Cumulative | shares   565,590 565,590      
Stock Repurchased, Value, Cumulative   $ 7,019,000 $ 7,019,000      
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 14,981,000 $ 14,981,000      
Stock Repurchased During Period, Shares (in shares) | shares   12,862 13,292 11,754    
Common Stock, Shares Authorized (in shares) | 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 (in shares) | shares   500,000 500,000      
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | shares     0      
Preferred Stock, Shares Issued (in shares) | shares   0 0      
Research and Development Expense   $ 3,115,000 $ 0 $ 243,000    
Advertising Expense   $ 609,000 $ 537,000 $ 436,000    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares   0 0 0    
Undesignated Shares [Member]            
Preferred Stock, Shares Authorized (in shares) | shares   5,000,000 5,000,000      
Series B Preferred Stock [Member]            
Preferred Stock, Shares Authorized (in shares) | shares   500,000 500,000      
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | shares   0        
Preferred Stock, Shares Issued (in shares) | shares   0        
Subsequent Event [Member]            
Stock Repurchase Program, Authorized Amount         $ 40,000,000  
Stock Repurchase Program, Remaining Authorized Repurchase Amount         $ 32,980,671  
Share Repurchase Program [Member]            
Stock Repurchased During Period, Shares (in shares) | shares   0        
Patents [Member]            
Finite-Lived Intangible Asset, Useful Life   20 years 20 years      
Patents [Member] | Maximum [Member]            
Finite-Lived Intangible Asset, Useful Life   20 years