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Condensed Consolidated Statements of Income (Loss) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue        
Product sales $ 11,911 $ 10,753 $ 34,459 $ 34,621
Barrier rentals 3,269 7,053 17,474 9,303
Royalty income 1,083 958 3,299 2,403
Shipping and installation revenue 5,188 4,818 15,103 13,650
Total revenue 21,451 23,582 70,335 59,977
Cost of sales 15,692 17,004 49,815 44,353
Gross profit 5,759 6,578 20,520 15,624
Operating expenses        
General and administrative expenses 1,100 1,720 4,198 4,938
Selling expenses 805 1,010 2,563 2,655
Total operating expenses 1,905 2,730 6,761 7,593
Operating income 3,854 3,848 13,759 8,031
Other income (expense)        
Interest expense (44) (56) (161) (175)
Interest income 72 22 85 36
Gain on sale of assets 0 16 0 19
Other income (expense), net (11) 14 17 50
Total other income (expense) 17 (4) (59) (70)
Income before income tax expense 3,871 3,844 13,700 7,961
Income tax expense 994 694 3,325 1,683
Net income $ 2,877 $ 3,150 $ 10,375 $ 6,278
Basic and diluted earnings per common share $ 0.54 $ 0.59 $ 1.96 $ 1.18
Weighted average number of common shares outstanding:        
Basic 5,305 5,304 5,305 5,283
Diluted 5,305 5,304 5,304 5,283