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Supplementary Financial Information to Item 8. (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                    
Net sales $ 3,746 $ 5,964 $ 3,335 $ 3,783 $ 3,531 $ 2,915 $ 3,082 $ 3,177 $ 16,828 $ 12,705
Gross profit 1,434 1,376 1,343 1,032 957 1,028 (109) 98 5,185 1,974
Net loss $ 65 $ (1,165) $ (4,340) $ (541) $ (1,308) $ (946) $ (2,254) $ (2,865) $ (5,981) $ (7,373)
Net loss per share, basic (in dollars per share) $ 0.01 $ (0.35) $ (1.36) $ (0.18)            
Net loss per share, diluted (in dollars per share) $ 0.01 $ (0.35) $ (1.36) $ (0.18)            
Basic (in shares) 3,491 3,308 3,192 3,086         3,270 2,462
Diluted (in shares) 4,307 3,308 3,192 3,086            
Net loss per share (basic and diluted) (in dollars per share)         $ (0.53) $ (0.38) $ (0.91) $ (1.18) $ (1.83) $ (2.99)
Basic and diluted (in shares)         2,480 2,474 2,467 2,425 3,270 [1] 2,462 [1]
[1]       *Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.