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Note 12 - Shareholders' Equity (Details Textual) - USD ($) | 3 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended | 127 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2023 | Feb. 25, 2022 | Feb. 24, 2022
Payments of Ordinary Dividends, Common Stock |  |  |  | $ 1,333,000 | $ 1,239,000 |  |  |  |
Payments for Repurchase of Common Stock |  |  |  | 1,195,000 | 452,000 |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost |  |  | $ 164,000 | 162,000 | 164,000 |  | $ 162,000 |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  | $ 0 |  |  | $ 0 |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  | 733,000 |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost |  |  | $ 154,000 |  | $ 154,000 |  |  |  |
Plan 1989 [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 1,600,000 |  |  | 1,600,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  | 10 years |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 0 | 0 | 231,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  | $ 3.36 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) |  |  |  | 2,000 | (0) |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) |  |  | 231,000 | 229,000 | 231,000 | 231,000 | 229,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  | $ 3.36 |  |  | $ 3.36 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  |  |  | (0) | (0) |  |  |  |
Plan 1989 [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 20.00% |  |  |  |  |
Plan 1989 [Member] | Share-Based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 20.00% |  |  |  |  |
Plan 1989 [Member] | Share-Based Payment Arrangement, Tranche Four [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 20.00% |  |  |  |  |
Plan 1989 [Member] | Share-Based Payment Arrangement, Tranche Five [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 20.00% |  |  |  |  |
Plan 1997 [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 400,000 |  |  | 400,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 0 | 0 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) |  |  |  | (0) | (0) |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) |  |  | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  |  |  | (0) | (0) |  |  |  |
Plan 1997 [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  |  | 10 years |  |  |  |
Share Repurchase Plan Renewal December2012 December2020 [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 5,000,000 |  |  | $ 5,000,000 | $ 5,000,000 | $ 2,750,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 4,200,000 |  |  | $ 4,200,000 |  |
Monthly Dividends Paid [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) |  | $ 0.005 | $ 0.0075 |  |  |  |  |  |
Monthly Dividends Paid [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.0075 |  |  |  |  |  |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  | 0 | 0 | 0 |  | 0 |  |
Common Class C [Member] |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  | 2,068,549 | 2,068,549 | 2,068,549 |  | 2,068,549 |  |
Payments of Ordinary Dividends, Common Stock |  |  |  | $ 186,000 | $ 171,000 |  |  |  |
Common Class C [Member] | Conversion of Class C to Class A [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  | 0 | 86 |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  | 13,866,999 | 13,866,999 | 13,866,999 |  | 13,866,999 |  |
Payments of Ordinary Dividends, Common Stock |  |  |  | $ 1,100,000 | $ 1,100,000 |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  | 412,257 | 89,287 |  | 1,221,226 |  |
Payments for Repurchase of Common Stock |  |  |  | $ 1,200,000 | $ 452,000 |  | $ 3,400,000 |  |
Common Stock Award, Number of Shares Granted (in shares) |  |  |  | 0 | 0 |  |  |  |
Common Class A [Member] | Conversion of Class C to Class A [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  | 0 | 86 |  |  |  |

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