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Note 11 - Shareholders' Equity (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended | 151 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Sep. 14, 2024 | Feb. 25, 2022 | Feb. 24, 2022
Payments of Ordinary Dividends, Common Stock |  | $ 1,208,000 | $ 1,278,000 |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) |  | $ 0.0075 | $ 0.0075 |  |  |  |
Payments for Repurchase of Common Stock |  | $ 1,969,000 | $ 2,172,000 |  |  |  |
Excise Tax Liability Accrued on Stock Repurchases |  | $ 19,000 | $ 22,000 |  |  |  |
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) |  | 125,100 | 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 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 |  |  |  |
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 | $ 6,500,000 | $ 5,000,000 | $ 5,000,000 | $ 5,000,000 | $ 2,750,000
Share Repurchase Program, Remaining Authorized, Amount |  | $ 4,100,000 |  | $ 4,100,000 |  |  |
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 |  |  |
Common Class C [Member] |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  | 2,068,549 | 2,068,549 | 2,068,549 |  |  |
Payments of Ordinary Dividends, Common Stock |  | $ 186,000 | $ 186,000 |  |  |  |
Common Class C [Member] | Conversion of Class C to Class A [Member] |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  | 0 | 0 |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  | 13,866,999 | 13,866,999 | 13,866,999 |  |  |
Payments of Ordinary Dividends, Common Stock |  | $ 1,000,000 | $ 1,100,000 |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  | 801,043 | 767,651 | 2,789,920 |  |  |
Payments for Repurchase of Common Stock |  | $ 2,000,000 | $ 2,200,000 | $ 7,600,000 |  |  |
Common Stock Award, Number of Shares Granted (in shares) |  | 0 | 0 |  |  |  |

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