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Restatement of Previously Issued Financial Statements (Details 5) - 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
Prior Period Adjustment [Abstract]                    
Reduction of net sales $ 54,000 $ 56,000 $ 41,000 $ 36,000 $ 143,000 $ 105,000 $ 115,000 $ 63,000 $ 187,000 $ 426,000
Increase in general and administrative expense for penalties 13,000 15,000 12,000 11,000 16,000 13,000 14,000 8,000 51,000 51,000
Decrease in other income for interest expense 23,000 21,000 18,000 15,000 14,000 10,000 8,000 5,000 77,000 37,000
Decrease in income tax benefit 0 0 0 0 (27,000) (9,000) 34,000 44,000 0 42,000
Total increase in net loss due to restatement items $ 90,000 $ 92,000 $ 71,000 $ 62,000 $ 146,000 $ 119,000 $ 171,000 $ 120,000 $ 315,000 $ 556,000