Statements of Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net sales	$ 32,104,774	$ 27,734,598
Cost of sales	26,632,616	24,374,991
Gross profit	5,472,158	3,359,607
Selling, general and administrative expenses	3,942,991	3,785,746
Operating income (loss)	1,529,167	(426,139)
Other income
Interest income	12,153	21,376
Other	51,761	36,566
Total other income	63,914	57,942
Income (loss) before provision (benefit) for income taxes	1,593,081	(368,197)
Provision (benefit) for income taxes	327,954	(186,654)
Net income (loss)	1,265,127	(181,543)
Other comprehensive income (loss), net of tax:
Unrealized gain on investment securities	429	746
Total comprehensive income (loss)	$ 1,265,556	$ (180,797)
Net income (loss) per share:
Basic	$ 0.52	$ (0.08)
Diluted	$ 0.52	$ (0.08)
Weighted average number of shares outstanding:
Basic	2,431,904	2,406,345
Diluted	2,431,904	2,406,345