Note 5 - Accounts Receivable, Net, Contract Asset and Contract Liability - Accounts Receivable, Net, Contract Asset and Contract Liability (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Apr. 30, 2023
Accounts Receivable, net	$ 3,260	$ 3,793
Contract Asset	3,169	1,893
Contract Liability	$ 9,256	$ 6,031