Consolidated Statements of Shareholders' Equity - 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]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Common Class A [Member]	Total
Balance at June 30, 2021 (in shares) at Jun. 30, 2020	13,866,913	2,068,635		855,432
Balance at Jun. 30, 2020	$ 347	$ 52	$ 15,623	$ (1,879)	$ (4)	$ 2,625		$ 16,764
Purchases of shares of Common Stock (class A) (in shares)	0	0		53,151			53,151
Purchases of shares of Common Stock (class A)	$ 0	$ 0	0	$ (314)	0	0		(314)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	0	0		(2,330)
Issuance of stock under ESPP of shares of Common Stock (class A)	$ 0	$ 0	8	$ 5	0	0		13
Share-based compensation, net of tax	0	0	43	0	0	0		43
Dividends declared	$ 0	$ 0	0	$ 0	0	(753)		(753)
Stock bonuses (in shares)	0	0		(7,300)
Stock bonuses	$ 0	$ 0	3	$ 16	0	0		19
Other Comprehensive Loss	0	0	0	0	6,591	0		6,591
Net Income	$ 0	$ 0	0	$ 0	0	31,961		31,961
Balance at June 30, 2022 (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
Purchases of shares of Common Stock (class A) (in shares)	0	0		89,287			89,287
Purchases of shares of Common Stock (class A)	$ 0	$ 0	0	$ (452)	0	0		(452)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	0	0		(10,191)
Issuance of stock under ESPP of shares of Common Stock (class A)	$ 0	$ 0	28	$ 25	0	0		53
Share-based compensation, net of tax	0	0	733	0	0	0		733
Dividends declared	0	0	0	0	0	(1,350)		(1,350)
Other Comprehensive Loss	0	0	0	0	(2,963)	0		(2,963)
Net Income	$ 0	$ 0	0	$ 0	0	3,819		3,819
Conversion of shares of class C common stock for class A common stock (in shares)	86	(86)		0
Balance at June 30, 2022 (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