Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Jun. 30, 2018	$ 6,302	$ 720	$ 55,641	$ 74,368	$ (49,160)	$ 87,871
Total comprehensive income (loss)				584	(1,571)	(987)
Repurchase of shares		(2)	(11)			(13)
Stock-based compensation	17		90			107
Conversion	10	(10)
Issuance of stock		2	10			12
Transfer of historical translation adjustment				40	(40)
Balance at Sep. 30, 2018	6,329	710	55,730	74,992	(50,771)	86,990
Balance at Jun. 30, 2018	6,302	720	55,641	74,368	(49,160)	87,871
Total comprehensive income (loss)						3,937
Balance at Mar. 31, 2019	6,191	701	55,134	79,006	(49,861)	91,171
Balance at Sep. 30, 2018	6,329	710	55,730	74,992	(50,771)	86,990
Total comprehensive income (loss)				1,926	696	2,622
Repurchase of shares	(154)	(1)	(766)			(921)
Stock-based compensation	2		65			67
Conversion	5	(5)
Issuance of stock		6	22			28
Balance at Dec. 31, 2018	6,182	710	55,051	76,918	(50,075)	88,786
Total comprehensive income (loss)				2,088	214	2,302
Repurchase of shares			(4)			(4)
Stock-based compensation			87			87
Conversion	9	(9)
Balance at Mar. 31, 2019	6,191	701	55,134	79,006	(49,861)	91,171
Translation loss					(49,627)
Pension and postretirement plans, net of taxes					(234)
Total					(49,861)
Total						(59,281)
Balance at Jun. 30, 2019	6,207	690	55,276	80,487	(59,281)	83,379
Total comprehensive income (loss)				778	(3,759)	(2,981)
Repurchase of shares		(2)	(8)			(10)
Stock-based compensation	57		157			214
Conversion	6	(6)
Balance at Sep. 30, 2019	6,270	682	55,425	81,265	(63,040)	80,602
Balance at Jun. 30, 2019	6,207	690	55,276	80,487	(59,281)	83,379
Total comprehensive income (loss)						(8,291)
Balance at Mar. 31, 2020	6,297	673	55,633	83,138	(70,223)	75,518
Balance at Sep. 30, 2019	6,270	682	55,425	81,265	(63,040)	80,602
Total comprehensive income (loss)				1,260	2,651	3,911
Repurchase of shares			(3)			(3)
Stock-based compensation	2		70			72
Conversion	8	(8)
Issuance of stock		7	30			37
Balance at Dec. 31, 2019	6,280	681	55,522	82,525	(60,389)	84,619
Total comprehensive income (loss)				613	(9,834)	(9,221)
Repurchase of shares		(1)	(3)			(4)
Stock-based compensation	10		114			124
Conversion	7	(7)
Balance at Mar. 31, 2020	$ 6,297	$ 673	$ 55,633	$ 83,138	(70,223)	75,518
Translation loss					(60,437)
Pension and postretirement plans, net of taxes					(9,786)
Total					$ (70,223)	$ (70,223)