Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue
Total revenue	$ 12,515	$ 13,209	$ 32,789	$ 34,249
Cost of goods sold	8,674	10,616	24,971	27,278
Gross profit	3,841	2,593	7,818	6,971
Operating expenses
General and administrative expenses	1,271	1,123	3,553	3,474
Selling expenses	521	717	1,684	1,924
Total operating expenses	1,792	1,840	5,237	5,398
Operating income (loss)	2,049	753	2,581	1,573
Other income (expense)
Interest expense	(53)	(43)	(166)	(127)
Interest income	8	9	26	31
Gain (loss) on sale of assets	(8)	19	58	30
Other income	22	20	41	64
Total other income (expense)	(31)	5	(41)	(2)
Income (loss) before income tax expense (benefit)	2,018	758	2,540	1,571
Income tax expense (benefit)	469	179	588	364
Net income (loss)	$ 1,549	$ 579	$ 1,952	$ 1,207
Basic and diluted earnings (loss) per common share	$ .30	$ 0.11	$ 0.38	$ 0.24
Weighted average number of common shares outstanding:
Basic (in thousands)	5,184	5,134	5,184	5,134
Diluted (in thousands)	5,184	5,138	5,184	5,138
Product Sales
Revenue
Total revenue	$ 6,485	$ 8,589	$ 20,036	$ 23,420
Barrier Rentals
Revenue
Total revenue	3,171	625	4,820	1,787
Royalty Income
Revenue
Total revenue	484	427	1,165	1,162
Shipping and Installation Revenue
Revenue
Total revenue	$ 2,375	$ 3,568	$ 6,768	$ 7,880