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, 2017	$ 6,268	$ 762	$ 55,579	$ 79,402	$ (49,985)	$ 92,026
Total comprehensive income (loss)				(4,458)	924	(3,534)
Repurchase of shares	(58)	(6)	(487)			(551)
Issuance of stock	21	13	244			278
Stock-based compensation	18		226			244
Conversion	24	(24)
Balance at Mar. 31, 2018	6,273	745	55,562	73,543	(49,061)	87,062
Dividends ($0.20 per share)				(1,401)		(1,401)
Balance at Dec. 31, 2017	6,254	759	55,467	71,906	(49,354)	85,032
Total comprehensive income (loss)				1,637	293	1,930
Repurchase of shares		(2)	(15)			(17)
Issuance of stock	8	(1)	51			58
Stock-based compensation			59			59
Conversion	11	(11)
Balance at Mar. 31, 2018	6,273	745	55,562	73,543	(49,061)	87,062
Translation loss					(42,317)
Pension and postretirement plans, net of taxes					(6,744)
Total					(49,061)
Total						(49,160)
Balance at Jun. 30, 2018	6,302	720	55,641	74,368	(49,160)	87,871
Total comprehensive income (loss)				4,598	(661)	3,937
Transfer of historical translation adjustment				40	(40)
Repurchase of shares	(154)	(3)	(781)			(938)
Issuance of stock		8	32			40
Stock-based compensation	19		242			261
Conversion	24	(24)
Balance at Mar. 31, 2019	6,191	701	55,134	79,006	(49,861)	91,171
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)	$ (49,861)