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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenues $ 5,685 $ 4,051 $ 14,813 $ 14,138
Cost of goods sold        
Cost of goods sold 4,972 3,312 13,445 12,974
Write down of inventory 546
Total cost of goods sold 4,972 3,312 13,445 13,520
Gross profit 713 739 1,368 618
Operating expenses        
Selling, general and administrative 1,231 1,190 3,738 4,001
Total operating expenses 1,231 1,190 3,738 4,001
Loss from continuing operations (518) (451) (2,370) (3,383)
Interest income (99) (55) (288) (242)
Other expense (income) 13 (1,735) (1,294) (904)
(Loss) income before taxes (432) 1,339 (788) (2,237)
Income tax expense (benefit) 2 (19) 5
Net (loss) income $ (434) $ 1,339 $ (769) $ (2,242)
(Loss) income per share:        
Basic $ (0.05) $ 0.15 $ (0.09) $ (0.26)
Diluted $ (0.05) $ 0.15 $ (0.09) $ (0.26)
Weighted average common shares outstanding:        
Basic 8,726 8,726 8,726 8,726
Diluted 8,726 8,726 8,726 8,726