Condensed Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue
Product sales	$ 10,752	$ 8,242
Barrier rentals	893	1,120
Royalty income	575	411
Shipping and installation revenue	4,536	3,069
Total revenue	16,756	12,842
Cost of sales	12,845	10,676
Gross profit	3,911	2,166
Operating expenses
General and administrative expenses	1,549	1,350
Selling expenses	853	762
Total operating expenses	2,402	2,112
Operating income (loss)	1,509	54
Other income (expense)
Interest expense	(60)	(64)
Interest income	8	6
Gain on sale of assets	3	82
Other income	44	25
Total other income (expense)	(5)	49
Income (loss) before income tax expense (benefit)	1,504	103
Income tax expense (benefit)	357	23
Net income (loss)	$ 1,147	$ 80
Basic earnings (loss) per common share	$ 0.22	$ 0.02
Diluted earnings (loss) per common share	$ 0.21	$ 0.02
Weighted average number of common shares outstanding:
Basic	5,309	5,256
Diluted	5,350	5,290