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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 |  |  |  |

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