Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue
Product sales	$ 38,748	$ 27,821
Barrier rentals	6,330	6,545
Royalty income	2,633	2,498
Shipping and installation revenue	11,869	13,267
Total revenue	59,580	50,131
Cost of sales	48,928	40,662
Gross profit	10,652	9,469
General and administrative expenses	5,990	5,551
Selling expenses	3,544	3,064
Total operating expenses	9,534	8,615
Operating income	1,118	854
Other income (expense)
Interest expense	(255)	(260)
Interest income	24	14
Gain on sale of assets	346	109
Other income, net	90	228
Total other income (expense), net	205	91
Income before income tax expense	1,323	945
Income tax expense	528	145
Net income	$ 795	$ 800
Basic and diluted earnings per share	$ 0.15	$ 0.15