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Accounts Receivable
 12 Months Ended
Dec. 31, 2020
Accounts Receivable [Abstract]  
Accounts Receivable

4.

Accounts Receivable


At December 31, 2020 and 2019, the Company’s accounts receivable consisted of the following:

 

 

2020

 

 

2019

 


Billed: 

 

 

 

 

 

 


Construction services 
 $ 1,391,555

$ 1,321,575

Engineering services

 

86,264

 

 

 

14,594

 


Medical revenue
1,157,819


—

Retainage receivable 

 

615,136

 

 

 

544,911

 


Other receivable
180,748


6,000

Total gross receivables

 

3,431,522

 

 

 

1,887,080

 


Less: allowance for doubtful accounts 

 

(795,914

 )

 

 

(785,895

)


Total net receivables

$

2,635,608

 

 

$

1,101,185

 


Receivables are evaluated for collectability and allowances for potential losses are established or maintained on applicable receivables.  The allowance for doubtful accounts was $795,914 as of December 31, 2020. There was a provision for doubtful accounts of $10,018, and no write offs for the year ended December 31, 2020. There was no provision for doubtful accounts and write offs were $54,000 for the year ended December 31, 2019.