Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 6,549,623	$ 6,799,970	$ 20,040,219	$ 22,744,294
Cost of sales	4,870,498	4,830,092	15,269,944	16,147,715
Gross profit	1,679,125	1,969,878	4,770,275	6,596,579
Selling, general and administrative expenses	762,329	725,596	2,316,864	2,135,293
Operating income	916,796	1,244,282	2,453,411	4,461,286
Other income
Interest and dividend income	10,231	7,301	30,646	25,716
Other	49,717	15,322	95,854	29,827
[NonoperatingIncomeExpense]	59,948	22,623	126,500	55,543
Income before income taxes	976,744	1,266,905	2,579,911	4,516,829
Provision for income taxes	270,714	351,674	713,822	1,249,104
Net income	706,030	915,231	1,866,089	3,267,725
Other comprehensive income, net of tax:
Unrealized (loss) gain on investment securities	(569)	(5)	(919)	1,700
Total comprehensive income	$ 705,461	$ 915,226	$ 1,865,170	$ 3,269,425
Net income per share:
Basic	$ 0.31	$ 0.41	$ 0.83	$ 1.48
Diluted	$ 0.31	$ 0.41	$ 0.82	$ 1.46
Weighted average number of shares outstanding:
Basic	2,249,175	2,217,641	2,240,834	2,201,619
Diluted	2,294,616	2,247,599	2,285,904	2,240,181
Dividends per share	$ 0.25	$ 0.25	$ 1.75	$ 1.725