Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Sales	$ 90,074	$ 81,196	$ 268,952	$ 235,551
Cost of sales	68,681	62,626	204,723	183,732
Gross profit	21,393	18,570	64,229	51,819
Operating expenses:
Salaries and commissions	9,778	8,975	28,878	26,647
Other operating expenses	8,028	6,999	23,016	21,303
Depreciation and amortization	541	549	1,627	2,234
Total operating expenses	18,347	16,523	53,521	50,184
Operating income	3,046	2,047	10,708	1,635
Interest expense	739	543	2,156	1,492
Income before income taxes	2,307	1,504	8,552	143
Income tax (benefit) expense	(148)	3,215	1,544	2,361
Net income (loss)	$ 2,455	$ (1,711)	$ 7,008	$ (2,218)
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.15	$ (0.11)	$ 0.43	$ (0.14)
Diluted (in dollars per share)	$ 0.15	$ (0.11)	$ 0.42	$ (0.14)
Weighted average common shares outstanding:
Basic (in shares)	16,404,805	16,274,663	16,380,807	16,260,862
Diluted (in shares)	16,563,245	16,274,663	16,492,217	16,260,862