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					11,844			11,844
Net income (loss)						27,212		27,212
Balance at Mar. 31, 2021	347	52	15,628	(2,051)	11,840	29,310	0	55,126
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)
Stock-based compensation expense						8,607		8,607
Other comprehensive income (loss), net of tax					11,832			11,832
Net income (loss)								8,607
Balance at Mar. 31, 2021	$ 347	$ 52	$ 15,628	$ (2,051)	$ 11,840	$ 29,310	$ 0	$ 55,126