| Disaggregation of revenues | 
  
    | Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |  |  |  
    |  |  | Hospitality |  | Education |  | Multiple Dwelling
 Units
 |  | Government |  | Healthcare |  | Total |  
    | Product |  | $ | 4,724,880 |  |  | $ | 279,486 |  |  | $ | 295,873 |  |  | $ | 193,970 |  |  | $ | 48,195 |  |  | $ | 5,542,404 |  |  
    | Recurring |  |  | 592,655 |  |  |  | 112,879 |  |  |  | 26,461 |  |  |  | – |  |  |  | – |  |  |  | 731,995 |  |  
    |  |  | $ | 5,317,535 |  |  | $ | 392,365 |  |  | $ | 322,334 |  |  | $ | 193,970 |  |  | $ | 48,195 |  |  | $ | 6,274,399 |  |    The following table presents the Company’s
product and recurring revenues disaggregated by industry for the year ended December 31, 2020.   
  
    |  |  | Hospitality |  | Education |  | Multiple Dwelling
 Units
 |  | Government |  | Healthcare |  | Total |  
    | Product |  | $ | 4,940,887 |  |  | $ | 443,001 |  |  | $ | 143,886 |  |  | $ | 214,477 |  |  | $ | – |  |  | $ | 5,742,251 |  |  
    | Recurring |  |  | 597,490 |  |  |  | 129,541 |  |  |  | 24,588 |  |  |  | – |  |  |  | – |  |  |  | 751,619 |  |  
    |  |  | $ | 5,538,377 |  |  | $ | 572,542 |  |  | $ | 168,474 |  |  | $ | 214,477 |  |  | $ | – |  |  | $ | 6,493,870 |  |  | 
| Contract Assets and Liabilities | 
  
    | Contract Assets and Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  
    |  |  | 2021 |  | 2020 |  | Variance |  
    | Contract assets |  | $ | 266,014 |  |  | $ | 104,989 |  |  | $ | 161,025 |  |  
    | Contract liabilities |  |  | 941,230 |  |  |  | 1,052,367 |  |  |  | (111,137 | ) |  |