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Note 15 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2019 | Sep. 28, 2014
Share-Based Payment Arrangement, Expense | $ 1.3 | $ 1.4 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 233,200 | 228,250 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 12.26 | $ 4.7 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 1.9 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 2 years 3 months 18 days |  |  |
The 2014 Plan [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 3,000,000
Minimum Percent Of Outstanding Common Stock Granted To Employees | 10.00% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent | 110.00% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 827,088 |  |  |
The 2014 Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 233,200 | 228,250 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 12.26 | $ 4.7 |  |
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Grant Date Fair Value | $ 2.9 | $ 1.1 |  |
The 2014 Plan [Member] | Restricted Stock [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 0 |
The 2014 Plan [Member] | Maximum [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | 10 years |  |  |
Options Award Expiry Period For Employees Owning Ten Percent Or More Shares (Year) | 5 years |  |  |
The 2014 Plan [Member] | Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Restricted Stock Restriction Period (Year) | 4 years |  |  |
The 2014 Plan [Member] | Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Restricted Stock Restriction Period (Year) | 1 year |  |  |

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