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10. Warrants (Tables) - Warrants [Member]
6 Months Ended
Sep. 30, 2017
Warrant activity
    Amount   Range of
Exercise
Price
   Weighted
Average
Exercise
Price
 
 Warrants outstanding at March 31, 2017    2,604,096    $2.10 - $12.05   $3.64 
 Exercised        n/a    n/a 
 Issued        n/a    n/a 
 Cancelled/Expired    (139,357)   $5.00 –$15.00   $6.52 
 Warrants outstanding at September 30, 2017    2,464,739    $2.10 - $12.05   $3.48 
 Warrants exercisable at September 30, 2017    2,464,739    $2.10 - $12.05   $3.48 
Assumptions used
Risk free interest rate   0.79% – 1.38%   
Average expected life   3 months – 2.33 years 
Expected volatility   65.9% – 111.1% 
Expected dividends   None