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The opening balance of the allowance for doubtful accounts is reconciled to the closing balance for expected credit losses as follows: (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Accounting Policies [Abstract]  
Balance at beginning $ 904,040
Increase in allowance 422,137
Recoveries (181,514)
Write-offs (26,809)
Ending balance $ 1,117,854