Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Sales	$ 99,332	$ 98,082	$ 193,636	$ 192,544
Cost of sales	77,607	75,830	150,532	149,154
Gross profit	21,725	22,252	43,104	43,390
Operating expenses:
Salaries and commissions	7,785	7,695	15,752	14,924
Other operating expenses	6,315	6,288	12,596	12,662
Depreciation and amortization	758	739	1,503	1,472
Total operating expenses	14,858	14,722	29,851	29,058
Operating income	6,867	7,530	13,253	14,332
Interest expense	252	329	525	595
Income before income taxes	6,615	7,201	12,728	13,737
Income taxes	2,562	2,780	4,813	5,300
Net income	$ 4,053	$ 4,421	$ 7,915	$ 8,437
Earnings per share:
Basic	$ 0.23	$ 0.25	$ 0.45	$ 0.48
Diluted	$ 0.23	$ 0.25	$ 0.44	$ 0.47
Weighted average common shares outstanding:
Basic	17,800,056	17,725,549	17,776,500	17,712,075
Diluted	17,898,911	17,805,979	17,872,307	17,810,441
Dividend declared per share	$ 0.11	$ 0.09	$ 0.20	$ 0.18