Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 5,460,600	$ 5,324,104	$ 5,667,624	$ 6,068,684	$ 6,731,987	$ 7,217,922	$ 7,242,020	$ 6,279,436	$ 22,521,012	$ 27,471,365
Gross profit	1,162,170	1,128,505	1,080,145	1,343,748	1,667,096	2,148,223	1,588,043	1,968,320	4,714,568	7,371,682
Net income	$ 191,659	$ 279,173	$ 244,079	$ 420,825	$ 710,376	$ 972,468	$ 614,427	$ 878,530	$ 1,135,736	$ 3,175,801
Net income per share:
Basic	$ 0.08	$ 0.12	$ 0.11	$ 0.18	$ 0.31	$ 0.43	$ 0.27	$ 0.38	$ 0.49	$ 1.39
Diluted	$ 0.08	$ 0.12	$ 0.11	$ 0.18	$ 0.30	$ 0.43	$ 0.27	$ 0.38	$ 0.49	$ 1.38