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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue    
Total revenue $ 43,862 $ 46,691
Cost of goods sold 32,820 36,722
Gross profit 11,042 9,969
General and administrative expenses 4,989 4,887
Selling expenses 2,294 2,536
Total operating expenses 7,283 7,423
Operating income 3,759 2,546
Other income (expense)    
Interest expense (217) (179)
Interest income 35 40
Gain on sale of assets 133 46
Other income 82 45
Total other income (expense) 33 (48)
Income before income tax expense 3,792 2,498
Income tax expense 1,127 549
Net income $ 2,665 $ 1,949
Basic and diluted earnings per share $ .51 $ 0.38
Product Sales    
Revenue    
Total revenue $ 26,776 $ 32,228
Barrier Rentals    
Revenue    
Total revenue 6,879 2,488
Royalty Income    
Revenue    
Total revenue 1,688 1,672
Shipping and Installation Revenue    
Revenue    
Total revenue $ 8,519 $ 10,303