Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 11,619,202	$ 9,218,141	$ 7,303,109	$ 8,337,399	$ 7,827,194	$ 5,663,161	$ 11,531,105	$ 7,496,423	$ 36,477,851	$ 32,517,883
Gross profit	2,403,565	2,150,439	1,516,235	992,934	1,870,296	1,255,204	3,075,598	1,461,154	7,063,173	7,662,252
Net income	$ 1,140,809	$ 922,456	$ 217,758	$ 61,671	$ 700,398	$ 317,764	$ 1,614,871	$ 442,764	$ 2,342,694	$ 3,075,797
Net income per share:
Basic	$ 0.48	$ 0.39	$ 0.09	$ 0.03	$ 0.30	$ 0.14	$ 0.69	$ 0.19	$ 0.99	$ 1.32
Diluted	$ 0.47	$ 0.39	$ 0.09	$ 0.03	$ 0.29	$ 0.14	$ 0.69	$ 0.19	$ 0.98	$ 1.31