Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Sales	$ 81,196	$ 65,222	$ 235,551	$ 192,387
Cost of sales	62,626	53,177	183,732	154,513
Gross profit	18,570	12,045	51,819	37,874
Operating expenses:
Salaries and commissions	8,975	7,148	26,647	20,895
Other operating expenses	6,999	5,969	21,303	17,302
Depreciation and amortization	549	732	2,234	2,198
Impairment charge				2,384
Total operating expenses	16,523	13,849	50,184	42,779
Operating income (loss)	2,047	(1,804)	1,635	(4,905)
Interest expense	543	129	1,492	453
Income (loss) before income taxes	1,504	(1,933)	143	(5,358)
Income tax expense (benefit)	3,215	(494)	2,361	(1,178)
Net (loss)	$ (1,711)	$ (1,439)	$ (2,218)	$ (4,180)
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.11)	$ (0.09)	$ (0.14)	$ (0.26)
Diluted (in dollars per share)	$ (0.11)	$ (0.09)	$ (0.14)	$ (0.26)
Weighted average common shares outstanding:
Basic (in shares)	16,274,663	16,302,870	16,260,862	16,388,892
Diluted (in shares)	16,274,663	16,302,870	16,260,862	16,388,892
Dividend declared per share (in dollars per share)		$ 0.03		$ 0.15