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DISCONTINUED OPERATIONS: (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Components of pretax income from discontinued operations:    
Revenues   $ 26,847
Operating expenses   (23,813)
General and administrative expenses   (1,281)
Interest expense   (2)
Gain on sale of the fulfillment services business   2,506
Income from discontinued operations before income taxes   4,257
Provision for income taxes   (265)
Income from discontinued operations $ 0 $ 3,992