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Note 7 - Stockholders' Equity (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended | 18 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Feb. 25, 2022 | Feb. 24, 2022
Statement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  | $ 938,000 | $ 233,000 |  |  |
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, Forfeitures in Period (in shares) |  | 0 |  |  | 0 |  |  |  | 2,000 | 0 |  |  |
Share-Based Payment Arrangement, Expense |  | $ 0 |  |  | $ 0 |  |  |  | $ 0 | $ 733,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 0 | $ 0 |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0 |  |
Plan1989 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 229,000 | 229,000 |  |  | 231,000 |  |  |  | 229,000 | 231,000 | 229,000 |  |
Treasury Stock, Common [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  | 193,040 | 87,407 | 39,965 | 19,487 | 10,457 | 13,647 |  |  |  |  |  |
Common Class A [Member] | Plan1989 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
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 | $ 6.05 | $ 6.05 |  |
Common Class A [Member] | Plan1997 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 2,000 | 2,000 |  |  | 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 | $ 2.74 | $ 2.74 |  |
Common Class A [Member] | Treasury Stock, Common [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  | 193,040 |  |  | 19,487 |  |  |  | 320,412 | 43,591 |  |  |
Payments for Repurchase of Common Stock |  | $ 556,000 |  |  | $ 97,000 |  |  |  | $ 938,000 | $ 233,000 |  |  |
Share Repurchase Plan Renewal December2012 December2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 5,000,000.0 | $ 5,000,000.0 |  |  |  |  |  |  | $ 5,000,000.0 |  | $ 5,000,000.0 | $ 5,000,000.0 | $ 2,750,000
Monthly Dividends Paid [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.0075 |  |  |  |  |  |  | $ 0.0050 |  |  | $ 0.0075 |  |

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