Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 6,569,641	$ 8,052,447	$ 13,490,596	$ 15,944,324
Cost of sales	5,673,627	5,907,939	10,399,446	11,317,623
Gross profit	896,014	2,144,508	3,091,150	4,626,701
Selling, general and administrative expenses	786,560	687,108	1,554,535	1,409,697
Operating income	109,454	1,457,400	1,536,615	3,217,004
Other income
Interest and dividend income	9,646	7,510	20,415	18,415
Other	31,425	9,656	46,137	14,505
[NonoperatingIncomeExpense]	41,071	17,166	66,552	32,920
Income before income taxes	150,525	1,474,566	1,603,167	3,249,924
Provision for income taxes	39,373	402,790	443,108	897,430
Net income	111,152	1,071,776	1,160,059	2,352,494
Other comprehensive income, net of tax:
Unrealized (loss) gain on investment securities	(221)	1,422	(350)	1,705
Total comprehensive income	$ 110,931	$ 1,073,198	$ 1,159,709	$ 2,354,199
Net income per share:
Basic	$ 0.05	$ 0.49	$ 0.52	$ 1.07
Diluted	$ 0.05	$ 0.48	$ 0.51	$ 1.05
Weighted average number of shares outstanding:
Basic	2,242,436	2,201,140	2,236,754	2,193,782
Diluted	2,297,463	2,238,745	2,281,643	2,236,553
Dividends per share	$ 1.25	$ 1.25	$ 1.5	$ 1.475