Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue
Total revenue	$ 46,691	$ 40,220
Cost of goods sold	36,722	29,730
Gross profit	9,969	10,490
General and administrative expenses	4,887	5,675
Selling expenses	2,536	2,599
Total operating expenses	7,423	8,274
Operating income	2,546	2,216
Other income (expense)
Interest expense	(179)	(176)
Interest income	40	42
Gain on sale of assets	46	126
Other income	55	51
Total other income (expense)	(38)	43
Income before income tax expense	2,508	2,259
Income tax expense	549	572
Net income	$ 1,959	$ 1,687
Basic and diluted earnings per share	$ 0.38	$ 0.33
Product Sales
Revenue
Total revenue	$ 32,228	$ 29,159
Barrier Rentals
Revenue
Total revenue	2,488	1,729
Royalties
Revenue
Total revenue	1,672	1,675
Shipping and Installation
Revenue
Total revenue	$ 10,303	$ 7,657