CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 14,067		$ 11,946		$ 26,070	$ 22,505
Costs of goods sold, inclusive of depreciation and amortization	10,798		9,022		20,728	17,531
Gross margin	3,269		2,924		5,342	4,974
Operating Expenses:
Selling, general and administrative	2,375		2,013		4,302	3,641
Interest expense	30		27		57	52
Total operating expenses	2,405		2,040		4,359	3,693
Income before income tax provision	864		884		983	1,281
Income tax provision	150		177		171	243
Net Income	$ 714	$ 98	$ 707	$ 331	$ 812	$ 1,038
Basic
Net Income per share (in dollars per share)	$ 0.31		$ 0.31		$ 0.35	$ 0.46
Diluted
Net income per share (in dollars per share)	$ 0.30		$ 0.30		$ 0.34	$ 0.45