New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Apr. 30, 2019	Feb. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 2,300	$ 3,000	$ 2,710
Operating lease liability	$ 2,300	$ 3,000	2,710
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets			3,000
Operating lease liability			$ 3,000