v3.21.2
4. Revenue (Details - Deferred revenue) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]    
Balance at beginning of year $ 13,992 $ 0
Deferral of revenue 389,665 81,796
Recognition of unearned revenue (284,153) (67,804)
Balance at end of year $ 119,504 $ 13,992