CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue
Product sales	$ 6,788	$ 7,243	$ 12,638	$ 14,662
Barrier rentals	1,962	1,182	3,447	6,958
Royalty income	771	692	1,198	1,112
Shipping and installation revenue	3,732	3,190	6,405	4,791
Total revenue	13,253	12,307	23,688	27,523
Cost of goods sold	10,023	8,993	18,810	18,488
Gross profit	3,230	3,314	4,878	9,035
Operating expenses
General and administrative expenses	1,409	1,340	2,568	2,665
Selling expenses	725	696	1,388	1,291
Total operating expenses	2,134	2,036	3,956	3,956
Operating income (loss)	1,096	1,278	922	5,079
Other income (expense)
Interest expense	(71)	(56)	(118)	(98)
Interest income	3	10	6	19
Gain on sale of assets	27	42	65	88
Other income	162	39	183	33
Total other income (expense)	121	35	136	42
Income (loss) before income tax expense (benefit)	1,217	1,313	1,058	5,121
Income tax expense (benefit)	307	328	267	1,269
Net income (loss)	$ 910	$ 985	$ 791	$ 3,852
Basic and diluted earnings (loss) per common share	$ 0.17	$ 0.19	$ 0.15	$ 0.74
Weighted average number of common shares outstanding:
Basic	5,230	5,202	5,230	5,202
Diluted	5,266	5,218	5,262	5,214