CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue
Product sales	$ 10,702	$ 6,788	$ 18,944	$ 12,638
Barrier rentals	700	1,962	1,819	3,447
Royalty income	594	771	1,005	1,198
Shipping and installation revenue	2,702	3,732	5,772	6,405
Total revenue	14,698	13,253	27,540	23,688
Cost of goods sold	12,912	10,023	23,588	18,810
Gross profit	1,786	3,230	3,952	4,878
Operating expenses
General and administrative expenses	1,884	1,409	3,233	2,568
Selling expenses	883	725	1,645	1,388
Total operating expenses	2,767	2,134	4,878	3,956
Operating income (loss)	(981)	1,096	(926)	922
Other income (expense)
Interest expense	(64)	(71)	(128)	(118)
Interest income	5	3	10	6
Gain on sale of assets	116	27	199	65
Other income	32	162	57	183
Total other income (expense)	89	121	138	136
Income (loss) before income tax expense (benefit)	(892)	1,217	(788)	1,058
Income tax expense (benefit)	(110)	307	(87)	267
Net income (loss)	$ (782)	$ 910	$ (701)	$ 791
Basic and diluted earnings (loss) per common share	$ (0.15)	$ 0.17	$ (0.13)	$ 0.15
Weighted average number of common shares outstanding:
Basic	5,256	5,230	5,256	5,230
Diluted	5,256	5,266	5,256	5,262