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Restatement of Previously Issued Financial Statements (Details) - USD ($)
 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
Dec. 31, 2018
Total net sales $ 5,054,000 $ 4,435,000 $ 3,347,000 $ 4,646,000 $ 6,175,000 $ 4,549,000 $ 5,727,000 $ 5,077,000 $ 17,482,000 $ 21,528,000  
Operating loss (990,000) (863,000) (1,830,000) (1,156,000) (2,697,000) (1,189,000) (812,000) (1,408,000) (4,839,000) (6,106,000)  
Net loss (961,000) (886,000) (1,843,000) (925,000) (2,605,000) (1,097,000) (659,000) (1,216,000) (4,615,000) (5,577,000)  
Total Shareholders' Equity 6,668,000       11,083,000       6,668,000 11,083,000 $ 16,320,000
As Previously Reported                      
Total net sales 5,108,000 4,491,000 3,388,000 4,682,000 6,318,000 4,654,000 5,842,000 5,140,000 17,669,000 21,954,000  
Operating loss (923,000) (792,000) (1,777,000) (1,109,000) (2,538,000) (1,071,000) (683,000) (1,337,000) (4,601,000) (5,629,000)  
Net loss (871,000) $ (794,000) $ (1,772,000) $ (863,000) (2,459,000) $ (978,000) $ (488,000) $ (1,096,000) (4,300,000) (5,021,000)  
Total Shareholders' Equity $ 7,694,000       $ 11,794,000       $ 7,694,000 $ 11,794,000