Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 6,731,987	$ 7,217,922	$ 7,242,020	$ 6,279,436	$ 8,970,864	$ 6,470,286	$ 5,697,083	$ 5,693,472	$ 27,471,365	$ 26,831,705
Gross profit	1,667,096	2,148,223	1,588,043	1,968,320	1,635,225	1,437,534	2,258,735	1,810,079	7,371,682	7,141,573
Net income	$ 710,376	$ 972,468	$ 614,427	$ 878,530	$ 546,455	$ 506,369	$ 1,219,082	$ 911,221	$ 3,175,801	$ 3,183,127
Net income per share:
Basic	$ 0.31	$ 0.43	$ 0.27	$ 0.38	$ 0.24	$ 0.22	$ 0.54	$ 0.40	$ 1.39	$ 1.40
Diluted	$ 0.30	$ 0.43	$ 0.27	$ 0.38	$ 0.23	$ 0.22	$ 0.54	$ 0.40	$ 1.38	$ 1.39