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4. Sale of Certain Accounts Receivable (Details Narrative) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss [Abstract]      
Accounts receivable sold $ 667,000 $ 1,052,000  
Outstanding receivables 222,000   $ 0
Line of credit 199,000   362,000
Allowance for bad debts 22,000   $ 0
Costs associated with financing line $ 5,693 $ 11,026