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5. Stockholders' Equity (Tables)
9 Months Ended
Feb. 28, 2019
Equity [Abstract]  
Schedule of Stock Option Activity
   Shares   Weighted Average Exercise Price   Weighted Average Remaining Contractual Term (Years)   Aggregate Intrinsic Value 
Options outstanding at June 1, 2018   2,600,000   $0.06           
Options granted      $           
Options exercised      $           
Options forfeited/expired   (1,000,000)  $0.10           
 Options outstanding at February 28, 2019   1,600,000   $0.03    1.17   $ 
 Options vested and expected to vest at February 28, 2019   1,600,000   $0.03    1.17   $ 
 Options exercisable at February 28, 2019   1,600,000   $0.03    1.17   $