CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue
Product sales	$ 10,898	$ 7,076	$ 29,842	$ 19,714
Barrier rentals	784	1,369	2,604	4,816
Royalty income	822	833	1,827	2,031
Shipping and installation revenue	3,147	2,678	8,918	9,083
Total revenue	15,651	11,956	43,191	35,644
Cost of goods sold	12,074	9,874	35,662	28,683
Gross profit	3,577	2,082	7,529	6,961
Operating expenses
General and administrative expenses	1,187	1,229	4,420	3,797
Selling expenses	888	849	2,533	2,236
Total operating expenses	2,075	2,078	6,953	6,033
Operating income (loss)	1,502	4	576	928
Other income (expense)
Interest expense	(64)	(69)	(192)	(187)
Interest income	6	3	17	9
Gain on sale of assets	53	29	252	94
Other income	16	26	72	208
Total other income (expense)	11	(11)	149	124
Income (loss) before income tax expense (benefit)	1,513	(7)	725	1,052
Income tax expense (benefit)	247	(12)	160	256
Net income (loss)	$ 1,266	$ 5	$ 565	$ 796
Basic and diluted earnings (loss) per common share	$ 0.24	$ 0.00	$ 0.11	$ 0.15
Weighted average number of common shares outstanding:
Basic	5,256	5,231	5,256	5,230
Diluted	5,298	5,286	5,293	5,281