Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net sales	$ 8,620,049	$ 4,205,068	$ 23,623,531	$ 18,432,648
Cost of sales	6,885,169	4,392,222	19,328,736	16,778,967
Gross profit (loss)	1,734,880	(187,154)	4,294,795	1,653,681
Selling, general and administrative expenses	933,725	990,311	3,114,715	2,850,415
Operating income (loss)	801,155	(1,177,465)	1,180,080	(1,196,734)
Other income
Interest income	2,987	2,486	6,299	19,456
Other	2,674	4,589	30,750	21,450
Total other income	5,661	7,075	37,049	40,906
Income (loss) before provision (benefit) for income taxes	806,816	(1,170,390)	1,217,129	(1,155,828)
Provision (benefit) for income taxes	145,457	(100,276)	228,508	(94,531)
Net income (loss)	661,359	(1,070,114)	988,621	(1,061,297)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on investment securities	838	(167)	838	871
Total comprehensive income (loss)	$ 662,197	$ (1,070,281)	$ 989,459	$ (1,060,426)
Net income (loss) per share:
Basic	$ 0.27	$ (0.44)	$ 0.41	$ (0.44)
Diluted	$ 0.27	$ (0.44)	$ 0.41	$ (0.44)
Weighted average number of shares outstanding:
Basic	2,434,836	2,405,670	2,429,009	2,403,641
Diluted	2,434,836	2,405,670	2,429,059	2,403,641
Dividends per share:	$ 0.00	$ 0.00	$ 0.00	$ 0.50