OTHER ASSETS: (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Apr. 30, 2017
Prepaid Expense and Other Assets	$ 2,321	$ 2,310
Prepaid expenses
Prepaid expenses	1,561	1,491
Deferred order entry costs
Deferred order entry costs	513	553
Other
Other	$ 247	$ 266