CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-Controlling Interest [Member]	Total
Balance at Jun. 30, 2019	$ 87	$ 208,881	$ (150,795)	$ (6,579)	$ 762	$ 52,356
Balance (in shares) at Jun. 30, 2019	8,756,156
Share-based compensation expense		99				99
Other comprehensive (loss) income:
Net income (loss)			3,406		155	3,561
Unrealized loss on available-for-sale investments				(171)		(171)
Foreign currency translation adjustment				98		98
Pension plan				90		90
Total comprehensive income (loss)						3,578
Balance at Sep. 30, 2019	$ 87	208,980	(147,389)	(6,562)	917	56,033
Balance (in shares) at Sep. 30, 2019	8,756,156
Balance at Jun. 30, 2020	$ 88	209,223	(143,077)	(6,206)	1,261	61,289
Balance (in shares) at Jun. 30, 2020	8,797,671
Share-based compensation expense		126				126
Forfeitures of restricted stock		(66)				(66)
Dividends forfeited with restricted stock forfeitures			14			14
Distributions to non-controlling interest					(15)	(15)
Other comprehensive (loss) income:
Net income (loss)			389		(22)	367
Unrealized loss on available-for-sale investments				(728)		(728)
Foreign currency translation adjustment				(114)		(114)
Pension plan				(45)		(45)
Total comprehensive income (loss)						(520)
Balance at Sep. 30, 2020	$ 88	$ 209,283	$ (142,674)	$ (7,093)	$ 1,224	$ 60,828
Balance (in shares) at Sep. 30, 2020	8,797,671