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Accounts receivable consists of trade receivables as follows: (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Receivables [Abstract]      
Billed receivables $ 5,139,757 $ 5,177,601 $ 5,226,468
Less: allowance for doubtful accounts (281,985) (209,887) (263,562)
   Total accounts receivable, net $ 4,857,772 $ 4,967,714 $ 4,962,906