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4. ACCRUED EXPENSES (Tables)
3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Accrued expense schedule

The major components of accrued expenses are summarized as follows:

 

   March 31,   December 31, 
   2021   2020 
Accrued salaries  $285,131   $178,449 
Accrued vacation   227,926    205,809 
Other accrued expense   18,240    7,309 
Total accrued expenses  $531,297   $391,567