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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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