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Equity Compensation Plans (Details - Option activity) - Equity Option [Member]
shares in Thousands
3 Months Ended
Jul. 31, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding, Beginning | shares 3,130
Weighted Average Exercise Price Outstanding, Beginning | $ / shares $ 6.56
Number of Options Granted | shares 21
Weighted Average Exercise Price Granted | $ / shares $ 24.63
Number of Options Exercised | shares (93)
Weighted Average Exercise Price Exercised | $ / shares $ 6.82
Number of Options Cancelled or Expired | shares (129)
Weighted Average Exercise Price Canceled | $ / shares $ 7.02
Number of Options Outstanding, Ending | shares 2,929
Weighted Average Exercise Price Outstanding, Ending | $ / shares $ 6.66