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Note 8 - Stockholders' Equity (Details Textual) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 19, 2024 | Feb. 25, 2022 | Feb. 24, 2022
Payments for Repurchase of Common Stock |  | $ 530,000 | $ 611,000 |  |  |
Excise Tax Liability Accrued on Stock Repurchases |  | $ 5,000 | $ 6,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 0 | 0 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 0 | $ 0 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  | 0 | 0 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) |  | 0 | 0 |  |  |
Plan 1989 [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) |  | 229,000 | 229,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) |  | 229,000 | 229,000 |  |  |
Common Class A [Member] | Plan 1989 [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share) |  | $ 6.05 | $ 6.05 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) |  | $ 6.05 | $ 6.05 |  |  |
Common Class A [Member] | Plan 1997 [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) |  | 2,000 | 2,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) |  | 2,000 | 2,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share) |  | $ 2.74 | $ 2.74 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) |  | $ 2.74 | $ 2.74 |  |  |
Treasury Stock, Common [Member] |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  | 197,887 | 198,213 |  |  |
Treasury Stock, Common [Member] | Common Class A [Member] |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  | 197,887 | 198,213 |  |  |
Payments for Repurchase of Common Stock |  | $ 520,000 | $ 611,000 |  |  |
Share Repurchase Plan Renewal December2012 December2020 [Member] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 5,000,000 |  | $ 6,500,000 | $ 5,000,000 | $ 2,750,000
O,2024,M1-12, Dividends [Member] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) |  | $ 0.0075 |  |  |  |
O,2024,M13, Dividends [Member] | Forecast [Member] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.0075 |  |  |  |  |

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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