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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Statement [Abstract]    
Revenues $ 18,311 $ 19,490
Cost of goods sold    
Cost of goods sold 16,918 18,063
Write down of inventory 546
Total cost of goods sold 16,918 18,609
Gross profit 1,393 881
Operating expenses    
Selling, general and administrative 5,255 5,165
Total operating expenses 5,255 5,165
Loss from continuing operations (3,862) (4,284)
Interest income (387) (334)
Other income (1,292) (969)
Loss before taxes (2,183) (2,981)
Income tax (benefit) expense (16) 5
Net loss $ (2,167) $ (2,986)
Loss per share:    
Basic $ (0.24) $ (0.34)
Diluted $ (0.24) $ (0.34)
Weighted average common shares outstanding:    
  Basic 8,858 8,726
  Diluted 8,858 8,726