Annual report pursuant to Section 13 and 15(d)

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

v3.20.2
Note 1 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Oct. 01, 2019
USD ($)
Depreciation, Total $ 1,944,186 $ 1,705,583  
Number of Reportable Segments 1    
Goodwill, Impairment Loss $ 0 0  
Amortization of Intangible Assets, Total 477,568 472,827  
Impairment of Long-Lived Assets Held-for-use 0 0  
Unrecognized Tax Benefits, Ending Balance 0 0  
Research and Development Expense, Total 1,269,542 1,089,637  
Advertising Expense $ 296,571 $ 278,057  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares 337,100 108,000  
Operating Lease, Right-of-Use Asset $ 2,539,100  
Operating Lease, Liability, Total $ 2,794,927    
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset     $ 2,400,000
Operating Lease, Liability, Total     $ 2,600,000
Patents [Member]      
Finite-Lived Intangible Asset, Useful Life (Year) 20 years 20 years  
Maximum [Member] | Patents [Member]      
Finite-Lived Intangible Asset, Useful Life (Year) 20 years