Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Jun. 30, 2020	29,680,843			34,900
Balance at Jun. 30, 2020	$ 59	$ 50,263	$ (44,156)	$ (99)	$ 6,067
Compensation expense for employee stock options	$ 0	231	0	$ 0	$ 231
Shares issued upon exercise of stock options (in shares)	157,334			0	157,334
Shares issued upon exercise of stock options	$ 1	23	0	$ 0	$ 23
Net income	$ 0	0	8,013	$ 0	8,013
Balance (in shares) at Jun. 30, 2021	29,838,177			34,900
Balance at Jun. 30, 2021	$ 60	50,516	(36,143)	$ (99)	14,334
Compensation expense for employee stock options	$ 0	369	0	$ 0	$ 369
Shares issued upon exercise of stock options (in shares)	146,333			0	146,333
Shares issued upon exercise of stock options	$ 0	34	0	$ 0	$ 34
Net income	$ 0	0	3,838	$ 0	3,838
Balance (in shares) at Jun. 30, 2022	29,984,510			34,900
Balance at Jun. 30, 2022	$ 60	$ 50,919	$ (32,305)	$ (99)	$ 18,575