Represents the amount of excise tax liability accrued on stock repurchases.

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Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Amount of cost to be recognized for option under share-based payment arrangement.

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The cash outflow to reacquire common stock during the period.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of share options (or share units) exercised during the current period.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Note 9 - Stockholders' Equity (Details Textual) - USD ($)	1 Months Ended	3 Months Ended						9 Months Ended
	Mar. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2024	Mar. 31, 2023	Feb. 25, 2022	Feb. 24, 2022
Payments for Repurchase of Common Stock								$ 1,748,000	$ 938,000
Excise Tax Liability Accrued on Stock Repurchases		$ 5,000						$ 17,000
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			0	2,000
Share-Based Payment Arrangement, Expense		$ 0			$ 0			$ 0	$ 0
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	$ 0	$ 0			$ 0			$ 0	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)		0			0			0	0
Plan 1989 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	229,000	229,000			229,000			229,000	229,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	229,000	229,000			229,000			229,000	229,000
Common Class A [Member] \| Plan 1989 [Member]
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
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share)					$ 6.05				$ 6.05
Common Class A [Member] \| Plan 1997 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	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
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)					2,000				2,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share)					$ 2.74				$ 2.74
Treasury Stock, Common [Member]
Treasury Stock, Shares, Acquired (in shares)		211,282	196,295	198,213	193,040	87,407	39,965
Treasury Stock, Common [Member] \| Common Class A [Member]
Treasury Stock, Shares, Acquired (in shares)		211,282			193,040			605,790	320,412
Payments for Repurchase of Common Stock		$ 577,000			$ 556,000			$ 1,700,000	$ 938,000
Share Repurchase Plan Renewal December2012 December2020 [Member]
Stock Repurchase Program, Authorized Amount	$ 5,000,000	$ 5,000,000						$ 5,000,000		$ 5,000,000	$ 2,750,000
Monthly Dividends Paid [Member]
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 0.0075							$ 0.0075