Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Net sales	$ 6,920,955	$ 7,891,877
Cost of sales	4,725,819	5,409,684
Gross profit	2,195,136	2,482,193
Selling, general and administrative expenses	767,975	722,589
Operating income	1,427,161	1,759,604
Other income
Interest and dividend income	10,769	10,905
Other	14,712	4,849
[NonoperatingIncomeExpense]	25,481	15,754
Income before income taxes	1,452,642	1,775,358
Provision for income taxes	403,735	494,640
Net income	1,048,907	1,280,718
Other comprehensive income, net of tax:
Unrealized (loss) gain on investment securities	(129)	283
Total comprehensive income	$ 1,048,778	$ 1,281,001
Net income per share:
Basic	$ 0.47	$ 0.59
Diluted	$ 0.46	$ 0.57
Weighted average number of shares outstanding:
Basic	2,231,072	2,186,424
Diluted	2,265,823	2,234,361
Dividends per share	$ 0.2500	$ 0.2250