Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] Common Class A [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] Common Class C [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock, Common [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock [Member] Common Class A [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock [Member] Common Class C [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Treasury Stock, Common [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class C [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member] Common Class A [Member]	Treasury Stock, Common [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Jun. 30, 2022															13,866,999	2,068,549			978,049
Balance at Jun. 30, 2022															$ 347	$ 52	$ 16,438		$ (2,599)	$ 3,624	$ 35,923	$ 53,785
Repurchases of shares of Common Stock (class A), including excise tax (in shares)															0	0			39,965
Repurchases of shares of Common Stock (class A), including excise tax															$ 0	$ 0	0		$ (133)	0	0	(133)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)															0	0			(3,983)
Issuance of stock under ESPP of shares of Common Stock (class A)															$ 0	$ 0	3		$ 10	0	0	13
Dividends declared															0	0	0		0	0	(335)	(335)
Net other comprehensive income (loss)															0	0	0		0	(486)	0	(486)
Net income (loss)															$ 0	$ 0	0		$ 0	0	53	53
Balance (in shares) at Sep. 30, 2022															13,866,999	2,068,549			1,014,031
Balance at Sep. 30, 2022															$ 347	$ 52	16,440		$ (2,722)	3,138	35,641	52,896
Share-based compensation, adjustment for forfeitures, net of tax															$ 0	$ 0	(1)		$ 0	0	0	(1)
Balance (in shares) at Jun. 30, 2022															13,866,999	2,068,549			978,049
Balance at Jun. 30, 2022															$ 347	$ 52	16,438		$ (2,599)	3,624	35,923	53,785
Repurchases of shares of Common Stock (class A), including excise tax (in shares)																		320,412
Net other comprehensive income (loss)																						(1,965)
Net income (loss)																						2,520
Balance (in shares) at Mar. 31, 2023															13,866,999	2,068,549			1,284,094
Balance at Mar. 31, 2023															$ 347	$ 52	16,442		$ (3,499)	1,659	37,444	52,445
Balance (in shares) at Sep. 30, 2022															13,866,999	2,068,549			1,014,031
Balance at Sep. 30, 2022															$ 347	$ 52	16,440		$ (2,722)	3,138	35,641	52,896
Repurchases of shares of Common Stock (class A), including excise tax (in shares)															0	0			87,407
Repurchases of shares of Common Stock (class A), including excise tax															$ 0	$ 0	0		$ (249)	0	0	(249)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)															0	0			(4,898)
Issuance of stock under ESPP of shares of Common Stock (class A)															$ 0	$ 0	1		$ 13	0	0	14
Dividends declared															0	0	0		0	0	(335)	(335)
Net other comprehensive income (loss)															0	0	0		0	(1,248)	0	(1,248)
Net income (loss)															$ 0	$ 0	0		$ 0	0	847	847
Balance (in shares) at Dec. 31, 2022															13,866,999	2,068,549			1,096,540
Balance at Dec. 31, 2022															$ 347	$ 52	16,441		$ (2,958)	1,890	36,153	51,925
Repurchases of shares of Common Stock (class A), including excise tax (in shares)															0	0		193,040	193,040
Repurchases of shares of Common Stock (class A), including excise tax															$ 0	$ 0	0		$ (556)	0	0	(556)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)															0	0			(5,486)
Issuance of stock under ESPP of shares of Common Stock (class A)															$ 0	$ 0	1		$ 15	0	0	16
Dividends declared															0	0	0		0	0	(329)	(329)
Net other comprehensive income (loss)															0	0	0		0	(231)	0	(231)
Net income (loss)															$ 0	$ 0	0		$ 0	0	1,620	1,620
Balance (in shares) at Mar. 31, 2023															13,866,999	2,068,549			1,284,094
Balance at Mar. 31, 2023															$ 347	$ 52	16,442		$ (3,499)	1,659	37,444	52,445
Balance (in shares) (Accounting Standards Update 2016-13 [Member]) at Jun. 30, 2023	0	0		0				13,866,999	2,068,549		1,370,325
Balance (in shares) at Jun. 30, 2023															13,866,999	2,068,549			1,370,325
Balance (Accounting Standards Update 2016-13 [Member]) at Jun. 30, 2023	$ 0	$ 0	$ 0	$ 0	$ 0	$ (183)	$ (183)	$ 347	$ 52	$ 16,442	$ (3,740)	$ 1,348	$ 37,564	$ 52,013
Balance at Jun. 30, 2023															$ 347	$ 52	16,442		$ (3,740)	1,348	37,747	52,196
Repurchases of shares of Common Stock (class A), including excise tax (in shares)															0	0			198,213
Repurchases of shares of Common Stock (class A), including excise tax															$ 0	$ 0	0		$ (617)	0	0	(617)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)															0	0			(5,494)
Issuance of stock under ESPP of shares of Common Stock (class A)															$ 0	$ 0	2		$ 15	0	0	17
Dividends declared															0	0	0		0	0	(322)	(322)
Net other comprehensive income (loss)															0	0	0		0	(214)	0	(214)
Net income (loss)															$ 0	$ 0	0		$ 0	0	(176)	(176)
Balance (in shares) at Sep. 30, 2023															13,866,999	2,068,549			1,563,044
Balance at Sep. 30, 2023															$ 347	$ 52	16,444		$ (4,342)	1,134	37,066	50,701
Balance (in shares) (Accounting Standards Update 2016-13 [Member]) at Jun. 30, 2023	0	0		0				13,866,999	2,068,549		1,370,325
Balance (in shares) at Jun. 30, 2023															13,866,999	2,068,549			1,370,325
Balance (Accounting Standards Update 2016-13 [Member]) at Jun. 30, 2023	$ 0	$ 0	$ 0	$ 0	$ 0	$ (183)	$ (183)	$ 347	$ 52	$ 16,442	$ (3,740)	$ 1,348	$ 37,564	$ 52,013
Balance at Jun. 30, 2023															$ 347	$ 52	16,442		$ (3,740)	1,348	37,747	52,196
Repurchases of shares of Common Stock (class A), including excise tax (in shares)																		605,790
Net other comprehensive income (loss)																						(517)
Net income (loss)																						1,018
Balance (in shares) at Mar. 31, 2024															13,866,999	2,068,549			1,958,262
Balance at Mar. 31, 2024															$ 347	$ 52	16,444		$ (5,456)	831	37,628	49,846
Balance (in shares) at Sep. 30, 2023															13,866,999	2,068,549			1,563,044
Balance at Sep. 30, 2023															$ 347	$ 52	16,444		$ (4,342)	1,134	37,066	50,701
Repurchases of shares of Common Stock (class A), including excise tax (in shares)															0	0			196,295
Repurchases of shares of Common Stock (class A), including excise tax															$ 0	$ 0	0		$ (566)	0	0	(566)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)															0	0			(6,100)
Issuance of stock under ESPP of shares of Common Stock (class A)															$ 0	$ 0	0		$ 17	0	0	17
Dividends declared															0	0	0		0	0	(320)	(320)
Net other comprehensive income (loss)															0	0	0		0	(171)	0	(171)
Net income (loss)															$ 0	$ 0	0		$ 0	0	1,229	1,229
Balance (in shares) at Dec. 31, 2023															13,866,999	2,068,549			1,753,239
Balance at Dec. 31, 2023															$ 347	$ 52	16,444		$ (4,891)	963	37,975	50,890
Repurchases of shares of Common Stock (class A), including excise tax (in shares)															0	0		211,282	211,282
Repurchases of shares of Common Stock (class A), including excise tax															$ 0	$ 0	0		$ (582)	0	0	(582)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)															0	0			(6,259)
Issuance of stock under ESPP of shares of Common Stock (class A)															$ 0	$ 0	0		$ 17	0	0	17
Dividends declared															0	0	0		0	0	(312)	(312)
Net other comprehensive income (loss)															0	0	0		0	(132)	0	(132)
Net income (loss)															$ 0	$ 0	0		$ 0	0	(35)	(35)
Balance (in shares) at Mar. 31, 2024															13,866,999	2,068,549			1,958,262
Balance at Mar. 31, 2024															$ 347	$ 52	$ 16,444		$ (5,456)	$ 831	$ 37,628	$ 49,846