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Note 12 - Shareholders' Equity (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended | 139 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2022 | Feb. 25, 2022 | Feb. 24, 2022
Payments of Ordinary Dividends, Common Stock |  | $ 1,278,000 | $ 1,333,000 |  |  |  |
Payments for Repurchase of Common Stock |  | 2,172,000 | $ 1,195,000 |  |  |  |
Excise Tax Liability Accrued on Stock Repurchases |  | $ 22,000 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  | 0 |  |  |  |  |
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 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) |  | (0) | 2,000 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) |  | 229,000 | 229,000 | 229,000 | 231,000 |  |
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 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 |  |
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
Share Repurchase Program, Remaining Authorized, Amount |  | $ 4,000,000 |  | $ 4,000,000 |  |  |
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 |  |  |  |  |  |
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 |  |  |  |  |
Common Class C [Member] | Conversion of Class C to Class A [Member] |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  | 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 |  | $ 1,100,000 |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  | 767,651 | 412,257 | 1,988,877 |  |  |
Payments for Repurchase of Common Stock |  | $ 2,200,000 | $ 1,200,000 | $ 5,600,000 |  |  |
Common Stock Award, Number of Shares Granted (in shares) |  | 0 |  |  |  |  |
Common Class A [Member] | Plan 1997 [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) |  | 2,000 |  | 2,000 |  |  |

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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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