CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Class A [Member] Common Stock [Member]	Common Class C [Member] Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total
Balance at Jun. 30, 2019	$ 347	$ 52	$ 15,646	$ (1,888)	$ (206)	$ 7,761	$ 467	$ 22,179
Purchases of shares of Common Stock (class A)				(74)				(74)
Issuance of stock under ESPP shares of Common Stock (class A)			(1)	3				2
Dividends declared						(341)		(341)
Stock bonuses			(3)	6				3
Stock-based compensation expense			(6)					(6)
Deconsolidation of non-controlling interest							(463)	(463)
Other comprehensive income (loss), net of tax					197		114	311
Net income (loss)						(6,182)	(118)	(6,300)
Balance at Mar. 31, 2020	347	52	15,636	(1,953)	(9)	1,238	0	15,311
Balance at Dec. 31, 2019	347	52	15,638	(1,888)	(205)	2,964	379	17,287
Purchases of shares of Common Stock (class A)				(68)				(68)
Issuance of stock under ESPP shares of Common Stock (class A)			(1)	1				0
Dividends declared						(114)		(114)
Stock bonuses			(1)	2				1
Deconsolidation of non-controlling interest							(463)	(463)
Other comprehensive income (loss), net of tax					196		114	310
Net income (loss)						(1,612)	(30)	(1,642)
Balance at Mar. 31, 2020	347	52	15,636	(1,953)	(9)	1,238	0	15,311
Balance at Jun. 30, 2020	347	52	15,623	(1,879)	(4)	2,625	0	16,764
Purchases of shares of Common Stock (class A)				(189)				(189)
Issuance of stock under ESPP shares of Common Stock (class A)			2	2				4
Dividends declared						(527)		(527)
Stock bonuses			3	15				18
Other comprehensive income (loss), net of tax					1,699			1,699
Net income (loss)						32,829		32,829
Balance at Mar. 31, 2021	347	52	15,628	(2,051)	1,695	34,927	0	50,598
Balance at Dec. 31, 2020	347	52	15,627	(1,925)	8	21,003	0	35,112
Purchases of shares of Common Stock (class A)				(127)				(127)
Issuance of stock under ESPP shares of Common Stock (class A)			1	1				2
Dividends declared						(300)		(300)
Other comprehensive income (loss), net of tax					1,687			1,687
Net income (loss)						14,224		14,224
Balance at Mar. 31, 2021	$ 347	$ 52	$ 15,628	$ (2,051)	$ 1,695	$ 34,927	$ 0	$ 50,598