Condensed Statements of Shareholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at beginning at Jun. 30, 2019	$ 84,084	$ 16,127,826	$ 9,522,064	$ 25,733,974
Balance at beginning (in shares) at Jun. 30, 2019	8,408,351
Increase (Decrease) in Stockholders' Equity
Net income			1,014,556	1,014,556
Issuance of restricted stock	$ 325	(325)
Issuance of restricted stock (in shares)	32,500
Issuance of common stock upon exercise of options	$ 50	12,990		13,040
Issuance of common stock upon exercise of options (in shares)	5,000
Share-based compensation expense		209,954		209,954
Balance at ending at Sep. 30, 2019	$ 84,459	16,350,445	10,536,620	26,971,524
Balance at ending (in shares) at Sep. 30, 2019	8,445,851
Balance at beginning at Jun. 30, 2020	$ 85,678	16,480,134	13,683,503	$ 30,249,315
Balance at beginning (in shares) at Jun. 30, 2020	8,567,834			8,567,834
Increase (Decrease) in Stockholders' Equity
Net income			535,262	$ 535,262
Issuance of restricted stock	$ 191	(191)
Issuance of restricted stock (in shares)	19,090
Issuance of common stock upon exercise of options	$ 193	(193)
Issuance of common stock upon exercise of options (in shares)	19,256
Taxes paid on stock option exercised on a net basis		(119,664)		(119,664)
Share-based compensation expense		191,103		191,103
Balance at ending at Sep. 30, 2020	$ 86,062	$ 16,551,189	$ 14,218,765	$ 30,856,016
Balance at ending (in shares) at Sep. 30, 2020	8,606,180			8,606,180