Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Total
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
Stock compensation expense for employee stock options	0	37	0	0	37
Net income (loss)	0	0	516	0	516
Net (loss) income	$ 0	0	516	$ 0	516
Shares issued upon exercise of employee stock options (in shares)	17,000			0
Shares issued upon exercise of employee stock options	$ 0	4	0	$ 0	4
Balance (in shares) at Sep. 30, 2021	29,855,177			34,900
Balance at Sep. 30, 2021	$ 60	50,557	(35,627)	$ (99)	14,891
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
Net income (loss)					2,344
Net (loss) income					2,344
Balance (in shares) at Mar. 31, 2022	29,867,844			34,900
Balance at Mar. 31, 2022	$ 60	50,813	(33,799)	$ (99)	16,975
Balance (in shares) at Sep. 30, 2021	29,855,177			34,900
Balance at Sep. 30, 2021	$ 60	50,557	(35,627)	$ (99)	14,891
Stock compensation expense for employee stock options	0	145	0	0	145
Net income (loss)	0	0	1,031	0	1,031
Net (loss) income	$ 0	0	1,031	$ 0	1,031
Shares issued upon exercise of employee stock options (in shares)	11,667			0
Shares issued upon exercise of employee stock options	$ 0	3	0	$ 0	3
Balance (in shares) at Dec. 31, 2021	29,866,844			34,900
Balance at Dec. 31, 2021	$ 60	50,705	(34,596)	$ (99)	16,070
Stock compensation expense for employee stock options	0	108	0	0	108
Net income (loss)	0	0	797	0	797
Net (loss) income	$ 0	0	797	$ 0	797
Shares issued upon exercise of employee stock options (in shares)	1,000			0
Shares issued upon exercise of employee stock options	$ 0	0	0	$ 0	0
Balance (in shares) at Mar. 31, 2022	29,867,844			34,900
Balance at Mar. 31, 2022	$ 60	50,813	(33,799)	$ (99)	16,975
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
Stock compensation expense for employee stock options	0	81	0	0	81
Net income (loss)	0	0	(35)	0	(35)
Net (loss) income	$ 0	0	(35)	$ 0	(35)
Balance (in shares) at Sep. 30, 2022	29,954,510			34,900
Balance at Sep. 30, 2022	$ 60	51,000	(32,340)	$ (99)	18,621
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
Net income (loss)					(74)
Net (loss) income					$ (74)
Shares issued upon exercise of employee stock options (in shares)					(0)
Balance (in shares) at Mar. 31, 2023	29,954,510			34,900
Balance at Mar. 31, 2023	$ 60	51,159	(32,379)	$ (99)	$ 18,741
Balance (in shares) at Sep. 30, 2022	29,954,510			34,900
Balance at Sep. 30, 2022	$ 60	51,000	(32,340)	$ (99)	18,621
Stock compensation expense for employee stock options	0	86	0	0	86
Net income (loss)	0	0	(55)	0	(55)
Net (loss) income	$ 0	0	(55)	$ 0	(55)
Balance (in shares) at Dec. 31, 2022	29,954,510			34,900
Balance at Dec. 31, 2022	$ 60	51,086	(32,395)	$ (99)	18,652
Stock compensation expense for employee stock options	0	73	0	0	73
Net income (loss)	0	0	16	0	16
Net (loss) income	$ 0	0	16	$ 0	16
Balance (in shares) at Mar. 31, 2023	29,954,510			34,900
Balance at Mar. 31, 2023	$ 60	$ 51,159	$ (32,379)	$ (99)	$ 18,741