3. Leases (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Lessee Disclosure [Abstract]
Operating lease expense	$ 900		$ 1,800
Operating lease payments			$ 1,600
Weighted average lease term	10 years 9 months 18 days		10 years 9 months 18 days
Weighted average discount rate	8.10%		8.10%
Loss lease termination	$ (355)	$ 0	$ (355)	$ 0