Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Sales	$ 85,270	$ 85,026
Cost of sales	64,011	64,537
Gross profit	21,259	20,489
Operating expenses:
Salaries and commissions	9,180	9,194
Other operating expenses	7,663	7,480
Depreciation and amortization	553	545
Total operating expenses	17,396	17,219
Operating income	3,863	3,270
Interest expense	741	644
Income before income taxes	3,122	2,626
Income tax expense	838	679
Net income	$ 2,284	$ 1,947
Earnings per share:
Basic (in dollars per share)	$ 0.14	$ 0.12
Diluted (in dollars per share)	$ 0.14	$ 0.12
Weighted average common shares outstanding:
Basic (in shares)	16,477,855	16,349,902
Diluted (in shares)	16,577,126	16,422,961