Quarterly report pursuant to Section 13 or 15(d)

C. REVENUE (Details - Contract assets and liabilities)

v3.20.2
C. REVENUE (Details - Contract assets and liabilities) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Contract assets $ 43,866 $ 188,120
Contract liabilities 654,754 764,184
Net contract liabilities $ 610,888 $ 576,064