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7. Earnings per Share: Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Details    
Stock options 5,525,000 4,612,500
Stock purchase warrants 5,697,249 2,824,075
Convertible debt 6,055,556 4,916,667
Total 17,277,805 12,353,242