CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue
Product sales	$ 8,242	$ 5,851
Barrier rentals	1,120	1,485
Royalty income	411	427
Shipping and installation revenue	3,069	2,672
Total revenue	12,842	10,435
Cost of goods sold	10,676	8,787
Gross profit	2,166	1,648
Operating expenses
General and administrative expenses	1,350	1,159
Selling expenses	762	662
Total operating expenses	2,112	1,821
Operating income (loss)	54	(173)
Other income (expense)
Interest expense	(64)	(48)
Interest income	6	3
Gain on sale of assets	82	39
Other income	25	20
Total other income (expense)	49	14
Income (loss) before income tax expense (benefit)	103	(159)
Income tax expense (benefit)	23	(40)
Net income (loss)	$ 80	$ (119)
Basic and diluted earnings (loss) per common share	$ 0.02	$ (0.02)
Weighted average number of common shares outstanding:
Basic	5,256	5,230
Diluted	5,290	5,230