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Note 11 - Stock Options and Incentive Plans (Tables)
9 Months Ended
Jan. 31, 2022
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
  

Number of Shares

  

Weighted Average Grant Date Fair Value

 

Outstanding, April 30, 2020

  7,500,000  $0.40 

Forfeited, April 30, 2021

  (50,000) $0.40 

Forfeited, January 31, 2022

  (50,000) $0.40 

Total

  7,400,000  $0.40