6. Equity Compensation Plans (Details - Option activity) - Equity Option [Member] $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2021 USD ($) $ / shares shares
Number of Options
Number of Options Outstanding, Beginning | shares	2,896
Number of Options Granted | shares	914
Number of Options Exercised | shares	(559)
Number of Options Cancelled or Expired | shares	(121)
Number of Options Outstanding, Ending | shares	3,130
Exercisable and expected to vest | shares	3,130
Exercisable at period end | shares	1,458
Weighted Average Exercise Price
Weighted Average Exercise Price Outstanding, Beginning | $ / shares	$ 6.2
Weighted Average Exercise Price Granted | $ / shares	7.68
Weighted Average Exercise Price Exercised | $ / shares	6.39
Weighted Average Exercise Price Canceled | $ / shares	7.23
Weighted Average Exercise Price Outstanding, Ending | $ / shares	6.56
Weighted Average Exercise Price, Exercisable and expected to vest | $ / shares	6.56
Weighted Average Exercise Price Exercisable, at period end | $ / shares	$ 6.46
Weighted Average Remaining Contractual Life (in years)
Weighted Average Remaining Contractual Life (in years) Outstanding	5 years 4 months 28 days
Weighted Average Remaining Contractual Life (in years) Vested and expected to vest	5 years 4 months 28 days
Weighted Average Remaining Contractual Life (in years) Exercisable, at period end	4 years 9 months
Aggregate Intrinsic Value
Aggregate Intrinsic Value Outstanding | $	$ 46,452	[1]
Aggregate Intrinsic Value vested and expected to vest | $	46,452	[1]
Aggregate Intrinsic Value Exercisable at period end | $	$ 21,787	[1]

[1] Aggregate intrinsic value represents the difference between the exercise price of an option and the closing market price of our common stock on April 30, 2021, which was $21.41 per share.