CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue
Product sales	$ 7,076	$ 7,205	$ 19,714	$ 21,868
Barrier rentals	1,369	1,708	4,816	8,667
Royalty income	833	676	2,031	1,788
Shipping and installation revenue	2,678	3,511	9,083	8,302
Total revenue	11,956	13,100	35,644	40,625
Cost of goods sold	9,874	9,898	28,683	28,388
Gross profit	2,082	3,202	6,961	12,237
Operating expenses
General and administrative expenses	1,229	1,215	3,797	3,880
Selling expenses	849	719	2,236	2,010
Total operating expenses	2,078	1,934	6,033	5,890
Operating income (loss)	4	1,268	928	6,347
Other income (expense)
Interest expense	(69)	(47)	(187)	(145)
Interest income	3	10	9	29
Gain on sale of assets	29	205	94	293
Gain on forgiveness of PPP loan	0	2,692	0	2,692
Other income	26	8	208	41
Total other income (expense)	(11)	2,868	124	2,910
Income (loss) before income tax expense (benefit)	(7)	4,136	1,052	9,257
Income tax expense (benefit)	(12)	442	256	1,711
Net income (loss)	$ 5	$ 3,694	$ 796	$ 7,546
Basic and diluted earnings (loss) per common share	$ 0.00	$ 0.71	$ 0.15	$ 1.45
Weighted average number of common shares outstanding:
Basic	5,231	5,202	5,230	5,202
Diluted	5,286	5,220	5,281	5,217