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Note 8 - Stockholders' Equity (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 18 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Feb. 25, 2022 | Feb. 24, 2022
Payments for Repurchase of Common Stock |  |  |  |  |  | $ 1,171,000 | $ 382,000 |  |  |
Excise Tax Liability Accrued on Stock Repurchases |  | $ 6,000 |  |  |  | $ 12,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 0 |  | 0 |  | 0 | 0 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  | 0 |  | 0 |  | 0 | 0 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) |  | 0 |  | 0 |  | 0 | 2,000 |  |  |
Share-Based Payment Arrangement, Expense |  | $ 0 |  | $ 0 |  | $ 0 | $ 0 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 0 | $ 0 |  | $ 0 |  | $ 0 | $ 0 | $ 0 |  |
Plan 1989 [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 229,000 | 229,000 |  | 229,000 |  | 229,000 | 229,000 | 229,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 229,000 | 229,000 |  | 229,000 |  | 229,000 | 229,000 | 229,000 |  |
Common Class A [Member] | Plan 1989 [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ 6.05 | $ 6.05 |  |  |  | $ 6.05 |  | $ 6.05 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 6.05 | $ 6.05 |  |  |  | $ 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 |  |  |  | 2,000 |  | 2,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 2,000 | 2,000 |  |  |  | 2,000 |  | 2,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ 2.74 | $ 2.74 |  |  |  | $ 2.74 |  | $ 2.74 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 2.74 | $ 2.74 |  |  |  | $ 2.74 |  | $ 2.74 |  |
Treasury Stock, Common [Member] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  | 196,295 | 198,213 | 87,407 | 39,965 |  |  |  |  |
Treasury Stock, Common [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  | 196,295 |  | 87,407 |  | 394,508 | 127,372 |  |  |
Payments for Repurchase of Common Stock |  | $ 560,000 |  | $ 249,000 |  | $ 1,200,000 | $ 382,000 |  |  |
Share Repurchase Plan Renewal December2012 December2020 [Member] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 5,000,000 | $ 5,000,000 |  |  |  | $ 5,000,000 |  | $ 5,000,000 | $ 5,000,000 | $ 2,750,000
Monthly Dividends Paid [Member] |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.0075 |  |  |  |  |  |  | $ 0.0075 |  |

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