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]	Noncontrolling Interest [Member]
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
Share-based compensation expense	2,256		2,256
Repurchase and retirement of stock	(1,840)	$ (3)	(1,825)	(12)
Repurchase and retirement of stock (in shares)		(354,090)
Lapse of restrictions on restricted stock	0	$ 5	(5)
Lapse of restrictions on restricted stock (in shares)		526,013
Dividends declared	(2,378)			(2,378)
Dividends forfeited with restricted stock forfeitures	8			8
Other comprehensive loss, net of taxes:
Net income (loss)	17,785			17,785
Unrealized loss on available-for-sale investments	(311)				(311)
Foreign currency translation adjustment	82				82
Pension plan	(155)				(155)
Total comprehensive loss	17,401
Balance at Mar. 31, 2018	58,916	$ 96	212,444	(150,095)	(3,274)	$ (255)
Balance (in shares) at Mar. 31, 2018		9,582,801				37,788
Balance at Dec. 31, 2017	62,117	$ 99	214,230	(148,990)	(2,967)	$ (255)
Balance (in shares) at Dec. 31, 2017		9,936,891				37,788
Share-based compensation expense	39		39
Repurchase and retirement of stock	(1,840)	$ (3)	(1,825)	(12)
Repurchase and retirement of stock (in shares)		(354,090)
Other comprehensive loss, net of taxes:
Net income (loss)	(1,093)			(1,093)
Unrealized loss on available-for-sale investments	(311)				(311)
Foreign currency translation adjustment	61				61
Pension plan	(57)				(57)
Total comprehensive loss	(1,400)
Balance at Mar. 31, 2018	58,916	$ 96	212,444	(150,095)	(3,274)	$ (255)
Balance (in shares) at Mar. 31, 2018		9,582,801				37,788
Other comprehensive loss, net of taxes:
Adoption of ASU 2016-01	318
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
Adoption of ASU 2016-01	318			318
Share-based compensation expense	134		134
Repurchase and retirement of stock	(1,318)	$ (3)	(1,315)
Repurchase and retirement of stock (in shares)		(344,933)
Lapse of restrictions on restricted stock	0	$ 0
Lapse of restrictions on restricted stock (in shares)		17,500
Acquisition of non-controlling interest	768						768
Other comprehensive loss, net of taxes:
Net income (loss)	(122)			(122)			(10)
Unrealized loss on available-for-sale investments	(2,323)				(2,323)
Foreign currency translation adjustment	149				149
Pension plan	49				49
Total comprehensive loss	(2,575)
Balance at Mar. 31, 2019	53,393	$ 88	208,902	(151,599)	(4,756)		758
Balance (in shares) at Mar. 31, 2019		8,789,644
Balance at Dec. 31, 2018	51,411	$ 90	209,544	(153,010)	(5,213)		0
Balance (in shares) at Dec. 31, 2018		8,968,154
Share-based compensation expense	59		59
Repurchase and retirement of stock	(703)	$ (2)	(701)
Repurchase and retirement of stock (in shares)		(188,510)
Lapse of restrictions on restricted stock	0	$ 0
Lapse of restrictions on restricted stock (in shares)		10,000
Acquisition of non-controlling interest	768						768
Other comprehensive loss, net of taxes:
Net income (loss)	1,411			1,411			(10)
Unrealized loss on available-for-sale investments	366				366
Foreign currency translation adjustment	74				74
Pension plan	17				17
Total comprehensive loss	1,858
Balance at Mar. 31, 2019	53,393	$ 88	$ 208,902	$ (151,599)	(4,756)		$ 758
Balance (in shares) at Mar. 31, 2019		8,789,644
Other comprehensive loss, net of taxes:
Adoption of ASU 2016-01	$ (318)				$ (318)