Statements of Comprehensive (Loss) Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 4,205,068	$ 6,191,300	$ 18,432,648	$ 19,401,793
Cost of sales	4,392,222	5,280,367	16,778,967	15,874,364
Gross (loss) profit	(187,154)	910,933	1,653,681	3,527,429
Selling, general and administrative expenses	990,311	1,057,034	2,850,415	3,390,988
Operating (loss) income	(1,177,465)	(146,101)	(1,196,734)	136,441
Other income
Interest income	2,486	20,127	19,456	86,203
Other	4,589	3,391	21,450	23,568
Total other income	7,075	23,518	40,906	109,771
(Loss) income before provision for income taxes	(1,170,390)	(122,583)	(1,155,828)	246,212
(Benefit) provision for income taxes	(100,276)	(18,818)	(94,531)	39,237
Net (loss) income	(1,070,114)	(103,765)	(1,061,297)	206,975
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on investment securities	(167)	1,130	871	972
Total comprehensive (loss) income	$ (1,070,281)	$ (102,635)	$ (1,060,426)	$ 207,947
Net (loss) income per share:
Basic	$ (0.44)	$ (0.04)	$ (0.44)	$ 0.09
Diluted	$ (0.44)	$ (0.04)	$ (0.44)	$ 0.09
Weighted average number of shares outstanding:
Basic	2,405,670	2,394,727	2,403,641	2,391,247
Diluted	2,405,670	2,394,727	2,403,641	2,395,787
Dividends per share:	$ 0.00	$ 0.25	$ 0.50	$ 0.75