Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ 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, 2019							26,176	(209)
Balance at Jun. 30, 2019	$ 0	$ 0	$ 0	$ 0	$ (428)	$ (428)	$ 125,729	$ (1,468)	$ 1,468	$ 16	$ (5,808)	$ 119,937
Net income							0	0	0	0	6,218	6,218
Other comprehensive income (loss)							$ 0	$ 0	0	6	0	6
Stock compensation awards (in shares)							36	0
Stock compensation awards							$ 150	$ 0	0	0	0	150
Restricted stock units issued (in shares)							18	0
Restricted stock units issued							$ 0	$ 0	0	0	0	0
Shares issued for deferred compensation (in shares)							10	0
Shares issued for deferred compensation							$ 47	$ 0	0	0	0	47
Activity of treasury shares, net (in shares)							0	87
Activity of treasury shares, net							$ 0	$ 660	0	0	0	660
Deferred stock compensation							0	0	(660)	0	0	(660)
Stock compensation expense							$ 597	$ 0	0	0	0	597
Stock options exercised, net (in shares)							6	0
Stock options exercised, net							$ 29	$ 0	0	0	0	29
Dividends — $0.20 per share							$ 0	$ 0	0	0	(2,643)	(2,643)
Balance (in shares) at Dec. 31, 2019							26,246	(122)
Balance at Dec. 31, 2019							$ 126,552	$ (808)	808	22	(2,661)	123,913
Balance (in shares) at Jun. 30, 2020							26,466	(180)
Balance at Jun. 30, 2020							$ 127,713	$ (1,121)	1,121	(93)	(1,920)	125,700
Net income							0	0	0	0	4,198	4,198
Other comprehensive income (loss)							$ 0	$ 0	0	147	0	147
Stock compensation awards (in shares)							25	0
Stock compensation awards							$ 150	$ 0	0	0	0	150
Restricted stock units issued (in shares)							28	0
Restricted stock units issued							$ 0	$ 0	0	0	0	0
Shares issued for deferred compensation (in shares)							96	0
Shares issued for deferred compensation							$ 679	$ 0	0	0	0	679
Activity of treasury shares, net (in shares)							0	(83)
Activity of treasury shares, net							$ 0	$ (571)	0	0	0	(571)
Deferred stock compensation							0	0	571	0	0	571
Stock compensation expense							$ 902	$ 0	0	0	0	902
Stock options exercised, net (in shares)							33	0
Stock options exercised, net							$ 178	$ 0	0	0	0	178
Dividends — $0.20 per share							$ 0	$ 0	0	0	(2,681)	(2,681)
Balance (in shares) at Dec. 31, 2020							26,648	(263)
Balance at Dec. 31, 2020							$ 129,622	$ (1,692)	$ 1,692	$ 54	$ (403)	$ 129,273