Condensed Statements of Shareholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Jun. 30, 2020	$ 86,000	$ 16,480,000	$ 13,684,000	$ 30,250,000
Balance at beginning (in shares) at Jun. 30, 2020	8,567,834
Net income			535,000	535,000
Issuance of restricted  stock
Issuance of restricted stock (in shares)	19,090
Issuance of common stock upon exercise of options
Issuance of common stock upon exercise of options (in shares)	19,256
Taxes paid on stock options exercised on a net basis		(120,000)		(120,000)
Share-based compensation expense		191,000		191,000
Ending balance, value at Sep. 30, 2020	$ 86,000	16,551,000	14,219,000	30,856,000
Balance at ending (in shares) at Sep. 30, 2020	8,606,180
Beginning balance, value at Jun. 30, 2020	$ 86,000	16,480,000	13,684,000	30,250,000
Balance at beginning (in shares) at Jun. 30, 2020	8,567,834
Net income				1,962,000
Ending balance, value at Mar. 31, 2021	$ 86,000	16,826,000	15,423,000	32,335,000
Balance at ending (in shares) at Mar. 31, 2021	8,637,420
Beginning balance, value at Sep. 30, 2020	$ 86,000	16,551,000	14,219,000	30,856,000
Balance at beginning (in shares) at Sep. 30, 2020	8,606,180
Net income			1,204,000	1,204,000
Issuance of restricted  stock
Issuance of restricted stock (in shares)	18,000
Issuance of common stock upon exercise of options		46,000		46,000
Issuance of common stock upon exercise of options (in shares)	10,865
Taxes paid on stock options exercised on a net basis		(10,000)		(10,000)
Share-based compensation expense		239,000		239,000
Ending balance, value at Dec. 31, 2020	$ 86,000	17,141,000	15,647,000	32,874,000
Balance at ending (in shares) at Dec. 31, 2020	8,635,045
Net income			224,000	224,000
Issuance of restricted  stock
Issuance of common stock upon exercise of options
Issuance of common stock upon exercise of options (in shares)	2,375
Taxes paid on stock options exercised on a net basis		(11,000)		(11,000)
Share-based compensation expense		326,000		326,000
Ending balance, value at Mar. 31, 2021	$ 86,000	16,826,000	15,423,000	32,335,000
Balance at ending (in shares) at Mar. 31, 2021	8,637,420
Beginning balance, value at Jun. 30, 2021	$ 85,000	17,409,000	14,922,000	$ 32,416,000
Balance at beginning (in shares) at Jun. 30, 2021	8,533,209			8,533,209
Net income			439,000	$ 439,000
Issuance of restricted  stock
Issuance of restricted stock (in shares)	25,900
Issuance of common stock upon exercise of options	$ 1,000			1,000
Issuance of common stock upon exercise of options (in shares)	10,530
Taxes paid on stock options exercised on a net basis		(64,000)		(64,000)
Share-based compensation expense		249,000		249,000
Ending balance, value at Sep. 30, 2021	$ 86,000	17,594,000	15,361,000	33,041,000
Balance at ending (in shares) at Sep. 30, 2021	8,569,639
Beginning balance, value at Jun. 30, 2021	$ 85,000	17,409,000	14,922,000	$ 32,416,000
Balance at beginning (in shares) at Jun. 30, 2021	8,533,209			8,533,209
Net income				$ 1,922,000
Issuance of common stock upon exercise of options (in shares)				28,667
Ending balance, value at Mar. 31, 2022	$ 85,000	18,042,000	15,883,000	$ 34,010,000
Balance at ending (in shares) at Mar. 31, 2022	8,508,788			8,508,788
Beginning balance, value at Sep. 30, 2021	$ 86,000	17,594,000	15,361,000	$ 33,041,000
Balance at beginning (in shares) at Sep. 30, 2021	8,569,639
Net income			838,000	838,000
Issuance of restricted  stock
Issuance of restricted stock (in shares)	18,000
Issuance of common stock upon exercise of options
Issuance of common stock upon exercise of options (in shares)	1,387
Taxes paid on stock options exercised on a net basis		(6,000)		(6,000)
Share-based compensation expense		277,000		277,000
Repurchase of common stock	$ (1,000)		(662,000)	(663,000)
Repurchase of common stock (in shares)	(55,687)
Ending balance, value at Dec. 31, 2021	$ 85,000	17,865,000	15,537,000	33,487,000
Balance at ending (in shares) at Dec. 31, 2021	8,533,339
Net income			645,000	645,000
Issuance of restricted  stock
Issuance of common stock upon exercise of options
Taxes paid on stock options exercised on a net basis
Share-based compensation expense		177,000		177,000
Repurchase of common stock			(299,000)	(299,000)
Repurchase of common stock (in shares)	(24,551)
Ending balance, value at Mar. 31, 2022	$ 85,000	$ 18,042,000	$ 15,883,000	$ 34,010,000
Balance at ending (in shares) at Mar. 31, 2022	8,508,788			8,508,788