2. Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Apr. 30, 2019	May 02, 2019	Apr. 30, 2018
Revenue recognized previously accrued	$ 6,000	$ 2,200	$ 13,200	$ 12,200
Right-of-use asset	20,437		20,437		$ 0
Operating lease liability	22,756		22,756		22,756
Restricted Cash	350	1,150	350	1,150	1,150		$ 1,150
Interest incurred or capitalized			0		$ 0
Depreciation and amortization	$ 800	$ 700	2,276	2,006
Impairment of long lived assets			$ 0	$ 0
ASC 842 [Member]
Right-of-use asset						$ 23,300
Operating lease liability						$ 25,500