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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 |  |  |  |

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