Statements of Comprehensive (Loss) Income - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 27,734,598	$ 31,526,231
Cost of sales	24,374,991	25,967,616
Gross profit	3,359,607	5,558,615
Selling, general and administrative expenses	3,785,746	4,386,307
Operating (loss) income	(426,139)	1,172,308
Other income
Interest income	21,376	109,749
Other	36,566	27,132
Total other income	57,942	136,881
(Loss) income before (benefit) provision for income taxes	(368,197)	1,309,189
(Benefit) provision for income taxes	(186,654)	145,521
Net (loss) income	(181,543)	1,163,668
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on investment securities	746	(1,808)
Total comprehensive (loss) income	$ (180,797)	$ 1,161,860
Net (loss) income per share:
Basic	$ (0.08)	$ 0.49
Diluted	$ (0.08)	$ 0.49
Weighted average number of shares outstanding:
Basic	2,406,345	2,393,207
Diluted	2,406,345	2,396,618