Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock Including Additional Paid in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Key Executive Deferred Compensation [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock Including Additional Paid in Capital [Member]	Treasury Stock [Member]	Key Executive Deferred Compensation [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Jun. 30, 2018							25,884,000	(242,000)
Balance at Jun. 30, 2018					$ 591	$ 591	$ 124,104	$ (2,110)	$ 2,133		$ 15,124	$ 139,251
Net income (loss)											(16,339)	(16,339)
Other comprehensive income (loss)										16		16
Stock compensation awards (in shares)							104,000
Stock compensation awards							$ 354					354
Restricted stock units issued (in shares)							114,000
Restricted stock units issued
Shares issued for deferred compensation (in shares)							74,000
Shares issued for deferred compensation							$ 290					290
Activity of treasury shares, net (in shares)								33,000
Activity of treasury shares, net								$ 642				642
Deferred stock compensation									(665)			(665)
Stock-based compensation expense							981					981
Dividends — $0.20 per share											(5,184)	(5,184)
Balance (in shares) at Jun. 30, 2019							26,176,000	(209,000)
Balance at Jun. 30, 2019					$ (428)	$ (428)	$ 125,729	$ (1,468)	1,468	16	(5,808)	119,937
Net income (loss)											9,592	9,592
Other comprehensive income (loss)										(109)		(109)
Stock compensation awards (in shares)							72,000
Stock compensation awards							$ 300					300
Restricted stock units issued (in shares)							21,000
Restricted stock units issued
Shares issued for deferred compensation (in shares)							85,000
Shares issued for deferred compensation							$ 473					473
Activity of treasury shares, net (in shares)								29,000
Activity of treasury shares, net								$ 347				347
Deferred stock compensation									(347)			(347)
Stock-based compensation expense							599					599
Dividends — $0.20 per share											(5,276)	$ (5,276)
Stock options exercised, net (in shares)							112,000					143,766
Stock options exercised, net							$ 612					$ 612
Balance (in shares) at Jun. 30, 2020							26,466,000	(180,000)
Balance at Jun. 30, 2020							$ 127,713	$ (1,121)	$ 1,121	$ (93)	$ (1,920)	$ 125,700