CONDENSED CONSOLIDATED STATEMENTS OF INCOME (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]
Revenue	$ 12,768	$ 11,325	$ 35,273	$ 30,044
Costs and expenses:
Costs of goods sold, inclusive of depreciation and amortization	8,828	8,234	26,359	23,307
Gross margin	$ 3,940	$ 3,091	$ 8,914	$ 6,737
Gross margin %	30.90%	27.30%	25.30%	22.40%
Selling, general and administrative	$ 2,074	$ 2,085	$ 5,715	$ 5,548
Interest expense	28	18	80	56
Total expenses	10,930	10,337	32,154	28,911
Income before income tax provision	1,838	988	3,119	1,133
Income tax provision	381	317	624	331
Net income	$ 1,457	$ 671	$ 2,495	$ 802
Basic
Net Income per share	$ 0.63	$ 0.30	$ 1.10	$ 0.35
Diluted
Net income per share	$ 0.61	$ 0.29	$ 1.07	$ 0.35