CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 12,003	$ 10,559
Cost of goods sold, inclusive of depreciation and amortization	9,930	8,510
Gross margin	2,073	2,049
Operating Expenses:
Selling, general and administrative	1,927	1,627
Interest expense	27	25
Total operating expenses	1,954	1,652
Income before income tax provision	119	397
Income tax provision	21	66
Net income	$ 98	$ 331
Basic
Net income per share (in dollars per share)	$ 0.04	$ 0.14
Diluted
Net income per share (in dollars per share)	$ 0.04	$ 0.14