Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 5,693,472	$ 6,920,955
Cost of sales	3,883,393	4,725,819
Gross profit	1,810,079	2,195,136
Selling, general and administrative expenses	598,202	767,975
Operating income	1,211,877	1,427,161
Other income
Interest and dividend income	7,993	10,769
Other	9,657	14,712
Total other income	17,650	25,481
Income before income taxes	1,229,527	1,452,642
Provision for income taxes	318,306	403,735
Net income	911,221	1,048,907
Other comprehensive income, net of tax:
Unrealized loss on investment securities	(320)	(129)
Total comprehensive income	$ 910,901	$ 1,048,778
Net income per share:
Basic	$ 0.40	$ 0.47
Diluted	$ 0.40	$ 0.46
Weighted average number of shares outstanding:
Basic	2,270,949	2,231,072
Diluted	2,277,754	2,265,823
Dividends per share	$ 0.2500	$ 0.2500