Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue
Product sales	$ 28,500	$ 26,776
Barrier rentals	9,925	6,879
Royalty income	2,216	1,688
Shipping and installation revenue	10,001	8,519
Total revenue	50,642	43,862
Cost of goods sold	36,222	32,820
Gross profit	14,420	11,042
General and administrative expenses	5,416	4,989
Selling expenses	2,836	2,294
Total operating expenses	8,252	7,283
Operating income	6,168	3,759
Other income (expense)
Interest expense	190	217
Interest income	35	35
Gain on sale of assets	317	133
Gain on forgiveness of PPP loan	2,692	0
Other Income	72	82
Total other income (expense), net	2,926	33
Income before income tax expense	9,094	3,792
Income tax expense	1,524	1,127
Net income	$ 7,570	$ 2,665
Basic earnings per share	$ 1.45	$ 0.51
Diluted earnings per share	$ 1.43	$ 0.51