Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	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, 2021	13,866,913	2,068,635			898,953
Balance at Jun. 30, 2021	$ 347	$ 52	$ 15,677		$ (2,172)	$ 6,587	$ 33,833	$ 54,324
Repurchases of shares of Common Stock (class A) (in shares)	0	0			13,647
Repurchases of shares of Common Stock (class A)	$ 0	$ 0	0		$ (82)	0	0	(82)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	0	0			(2,228)
Issuance of stock under ESPP of shares of Common Stock (class A)	$ 0	$ 0	8		$ 6	0	0	14
Dividends declared	0	0	0		0	0	(338)	(338)
Other comprehensive income (loss), net of tax	0	0	0		0	(635)	0	(635)
Net income	0	0	0		0	0	2,390	2,390
Share-based compensation, net of tax	$ 0	$ 0	388		$ 0	0	0	388
Balance (in shares) at Sep. 30, 2021	13,866,913	2,068,635			910,372
Balance at Sep. 30, 2021	$ 347	$ 52	16,073		$ (2,248)	5,952	35,885	56,061
Balance (in shares) at Jun. 30, 2021	13,866,913	2,068,635			898,953
Balance at Jun. 30, 2021	$ 347	$ 52	15,677		$ (2,172)	6,587	33,833	54,324
Repurchases of shares of Common Stock (class A) (in shares)				24,104
Other comprehensive income (loss), net of tax								(1,222)
Net income								5,980
Balance (in shares) at Dec. 31, 2021	13,866,913	2,068,635			918,287
Balance at Dec. 31, 2021	$ 347	$ 52	16,425		$ (2,297)	5,365	39,137	59,029
Balance (in shares) at Sep. 30, 2021	13,866,913	2,068,635			910,372
Balance at Sep. 30, 2021	$ 347	$ 52	16,073		$ (2,248)	5,952	35,885	56,061
Repurchases of shares of Common Stock (class A) (in shares)	0	0		10,457	10,457
Repurchases of shares of Common Stock (class A)	$ 0	$ 0	0		$ (54)	0	0	(54)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	0	0			(2,542)
Issuance of stock under ESPP of shares of Common Stock (class A)	$ 0	$ 0	7		$ 5	0	0	12
Dividends declared	0	0	0		0	0	(338)	(338)
Other comprehensive income (loss), net of tax	0	0	0		0	(587)	0	(587)
Net income	0	0	0		0	0	3,590	3,590
Share-based compensation, net of tax	$ 0	$ 0	345		$ 0	0	0	345
Balance (in shares) at Dec. 31, 2021	13,866,913	2,068,635			918,287
Balance at Dec. 31, 2021	$ 347	$ 52	16,425		$ (2,297)	5,365	39,137	59,029
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	36,302	54,164
Repurchases of shares of Common Stock (class A) (in shares)	0	0			39,965
Repurchases of shares of Common Stock (class A)	$ 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
Share-based compensation, adjustment for forfeitures, net of tax	0	0	(1)		0	0	0	(1)
Dividends declared	0	0	0		0	0	(335)	(335)
Other comprehensive income (loss), net of tax	0	0	0		0	(486)	0	(486)
Net income	$ 0	$ 0	0		$ 0	0	107	107
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	36,074	53,329
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	36,302	54,164
Repurchases of shares of Common Stock (class A) (in shares)				127,372
Other comprehensive income (loss), net of tax								(1,734)
Net income								976
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	36,608	52,380
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	36,074	53,329
Repurchases of shares of Common Stock (class A) (in shares)	0	0		87,407	87,407
Repurchases of shares of Common Stock (class A)	$ 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)
Other comprehensive income (loss), net of tax	0	0	0		0	(1,248)	0	(1,248)
Net income	$ 0	$ 0	0		$ 0	0	869	869
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	$ 36,608	$ 52,380