v3.21.2
REVENUE (Details - Deferred revenue) - USD ($)
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]    
Balance at beginning of year $ 119,504 $ 13,992
Deferral of revenue 169,798 37,960
Recognition of unearned revenue (204,694) (30,668)
Balance at end of year $ 84,608 $ 21,284