2. Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	May 02, 2019	Apr. 30, 2019	Apr. 30, 2018
Right-of-use asset	$ 21,381		$ 21,381			$ 0
Operating lease liability	23,635		23,635
Depreciation and amortization	700	$ 700	1,467	$ 1,325
Revenue recognized previously accrued	6,400	3,100	12,600	10,000
Restricted Cash	$ 350	$ 1,150	350	1,150		$ 1,150	$ 1,150
Incurred interest			0
Impairment of long lived assets			$ 0	$ 0
ASC 842 [Member]
Right-of-use asset					$ 23,300
Operating lease liability					$ 25,500