CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at Jun. 30, 2016	$ 20,998	$ 92	$ 210,971	$ (189,265)	$ (545)	$ (255)
Balance (in shares) at Jun. 30, 2016		9,218,093				(37,788)
Dividends declared	(4,734)			(4,734)
Dividends forfeited with restricted stock forfeitures	120			120
Share-based compensation expense	931		931
Lapse of restriction on restricted stock	0	$ 2	(2)
Lapse of restriction on restricted stock (in shares)		172,785
Exercise of stock options	118		118
Exercise of stock options (in shares)		20,000
Reclassification of foreign currency translation adjustment from sale of Real-Time business	(2,159)				(2,159)
Other comprehensive income (loss), net of taxes:
Net income	28,381			28,381
Unrealized loss on available-for-sale investments	0
Foreign currency translation adjustment	(478)				(478)
Pension plan	292				292
Total comprehensive income	28,195
Balance at Jun. 30, 2017	43,469	$ 94	212,018	(165,498)	(2,890)	$ (255)
Balance (in shares) at Jun. 30, 2017		9,410,878				(37,788)
Dividends declared	(2,378)			(2,378)
Dividends forfeited with restricted stock forfeitures	8			8
Share-based compensation expense	2,313		2,313
Lapse of restriction on restricted stock	0	$ 5	(5)
Lapse of restriction on restricted stock (in shares)		526,013
Reclassification of foreign currency translation adjustment from sale of Real-Time business	170
Repurchase and retirement of treasury shares	(4,008)	$ (8)	(4,243)	(12)		$ 255
Repurchase and retirement of treasury shares (in shares)		(819,814)				37,788
Other comprehensive income (loss), net of taxes:
Net income	16,085			16,085
Unrealized loss on available-for-sale investments	(1,373)				(1,373)
Foreign currency translation adjustment	1,977				1,977
Pension plan	(27)				(27)
Total comprehensive income	16,662
Balance at Jun. 30, 2018	$ 56,066	$ 91	$ 210,083	$ (151,795)	$ (2,313)	$ 0
Balance (in shares) at Jun. 30, 2018		9,117,077				0