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11. REVENUES
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
REVENUES
11. REVENUES

 

For each of the identified periods, revenues can be categorized into the following:

 

   For the Three Months Ended 
   March 31, 
   2021   2020 
Product sales  $1,265,427   $1,255,852 
Maintenance fees   11,243    3,679 
Professional services   3,750    14,525 
Shipping and handling   98,820    46,511 
Discounts and allowances   (6,848)   (3,515)
Total revenues  $1,372,392   $1,317,052 

 

At March 31, 2021 and December 31, 2020, deferred revenue was $97,541 and $107,489, respectively. The March 31, 2021 balance consists of deferred maintenance fees pertaining to services to be provided through the fourth quarter of 2026.

 

Revenues during the quarters ended March 31, 2021 and 2020 had a heavy concentration of sales to federal, state and local governments which represented 70% and 82% of revenues, respectively.