OTHER ASSETS: (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Apr. 30, 2016
Prepaid Expense and Other Assets	$ 2,310	$ 3,478
Prepaid Expenses [Member]
Prepaid expenses	1,491	2,358
Deferred Order Entry Costs [Member]
Deferred order entry costs	553	845
Other Intangible Assets [Member]
Other	$ 266	$ 275