CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue	$ 11,946	$ 9,616	$ 22,505	$ 18,719
Cost, expenses and other (income):
Costs of goods sold, inclusive of depreciation and amortization	9,022	7,830	17,531	15,074
Selling, general and administrative	2,013	1,622	3,641	3,462
Interest expense	27	15	52	38
Total expenses	11,062	9,467	21,224	18,574
Income before income tax provision	884	149	1,281	145
Income tax provision	177	44	243	14
Net income	$ 707	$ 105	$ 1,038	$ 131
Basic
Net Income per share (in dollars per share)	$ 0.31	$ 0.05	$ 0.46	$ 0.06
Diluted
Net income per share (in dollars per share)	$ 0.30	$ 0.05	$ 0.45	$ 0.06