Quarterly Financial Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012
Quarterly Financial Information Details
Net sales	$ 11,553,916	$ 6,799,970	$ 8,052,447	$ 7,891,877	$ 8,115,730	$ 7,661,946	$ 8,265,754	$ 7,993,927	$ 34,298,210	$ 32,037,357
Gross profit	4,102,990	1,969,878	2,144,508	2,482,193	2,232,105	2,404,390	2,181,860	2,001,808	10,699,569	8,820,163
Net Income	$ 2,294,700	$ 915,231	$ 1,071,776	$ 1,280,718	$ 1,129,638	$ 1,262,863	$ 1,070,863	$ 926,904	$ 5,562,425	$ 4,390,268
Net income per share
Basic	$ 1.03	$ 0.41	$ 0.49	$ 0.59	$ 0.52	$ 0.58	$ 0.49	$ 0.43	$ 2.52	$ 2.02
Diluted	$ 1.02	$ 0.41	$ 0.48	$ 0.57	$ 0.51	$ 0.57	$ 0.49	$ 0.42	$ 2.48	$ 1.99