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, 2018	$ 91	$ 210,083	$ (151,795)	$ (2,313)		$ 56,066
Balance (in shares) at Jun. 30, 2018	9,117,077
Adoption of ASU 2016-01			318	(318)
Share-based compensation expense		59				59
Repurchase and retirement of stock		(115)				(115)
Repurchase and retirement of stock (in shares)	(23,008)
Other comprehensive income, net of taxes:
Net income			(3)			(3)
Unrealized loss on available-for-sale investments				(877)		(877)
Foreign currency translation adjustment				13		13
Pension and post-retirement benefits, net of tax				26		26
Total comprehensive income						(841)
Balance at Sep. 30, 2018	$ 91	210,027	(151,480)	(3,469)		55,169
Balance (in shares) at Sep. 30, 2018	9,094,069
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 income, net of taxes:
Net income			3,406		155	3,561
Unrealized loss on available-for-sale investments				(171)		(171)
Foreign currency translation adjustment				98		98
Pension and post-retirement benefits, net of tax				90		90
Total comprehensive income						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