Quarterly report pursuant to Section 13 or 15(d)

C. REVENUE (Tables)

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C. REVENUE (Tables)
 3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
Summary of product and recurring revenues disaggregated by industry
    Hospitality     Education     Multiple Dwelling Units     Government     Total  
Product   $ 1,694,649     $ 255,736     $ 200,426     $ 435,858     $ 2,586,669  
Recurring     156,272       19,445       816       –       176,533  
    $ 1,850,921     $ 275,181     $ 201,242     $ 435,858     $ 2,763,202  
Contract Assets and Liabilities
    March 31,
2019		     December 31,
2018		     Variance  
Contract assets   $ 446,662     $ 314,749     $ 131,913  
Contract liabilities     1,063,276       1,232,623       (169,347 )
Net contract liabilities   $ 616,614     $ 917,874     $ (301,260 )