Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial information

		First Quarter		Second Quarter		Third Quarter		Fourth Quarter
NET SALES	2016	$	53,367	$	57,342	$	64,429	$	69,877
	2015	40,767		45,679		49,015		51,835
GROSS MARGIN	2016	$	45,421	$	49,948	$	56,432	$	60,807
	2015	35,619		40,590		44,036		46,849
NET INCOME	2016	$	1,197	$	1,975	$	3,321	$	5,481
	2015	4,087		5,430		6,551		13,378
NET INCOME PER COMMON SHARE - BASIC	2016	$	0.01	$	0.02	$	0.03	$	0.05
	2015	0.04		0.05		0.06		0.13
NET INCOME PER COMMON SHARE - DILUTED	2016	$	0.01	$	0.02	$	0.03	$	0.05
	2015	0.04		0.05		0.06		0.11