3. Leases (Details - Components of lease) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jan. 31, 2020	Jan. 31, 2020
Lessee Disclosure [Abstract]
Operating lease cost	$ 798	$ 2,570
Short-term lease cost	83	83
Variable lease cost	155	488
Total lease cost	$ 1,036	$ 3,141