Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 9,301,950	$ 4,205,068	$ 6,962,065	$ 7,265,515	$ 12,124,438	$ 6,191,300	$ 7,286,674	$ 5,923,819	$ 27,734,598	$ 31,526,231
Gross profit (loss)	1,705,926	(187,154)	713,461	1,127,374	2,031,186	910,933	1,480,148	1,136,348	3,359,607	5,558,615
Net income (loss)	$ 879,753	$ (1,070,114)	$ (181,006)	$ 189,824	$ 956,693	$ (103,765)	$ 228,964	$ 81,776	$ (181,543)	$ 1,163,668
Net income (loss) per share -
Basic	$ 0.36	$ (0.44)	$ (0.08)	$ 0.08	$ 0.40	$ (0.04)	$ 0.10	$ 0.03	$ (0.08)	$ 0.49
Diluted	$ 0.36	$ (0.44)	$ (0.08)	$ 0.08	$ 0.40	$ (0.04)	$ 0.10	$ 0.03	$ (0.08)	$ 0.49