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INTEREST (EXPENSE) INCOME, NET (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
INTEREST (EXPENSE) INCOME, NET        
Interest income on savings $ 2 $ 43 $ 8 $ 102
Interest income on notes 1 2 1 3
Interest on deferred purchase price 0 96 0 160
Interest expense (15) 0 (15) 0
Interest income, net $ (12) $ 141 $ (6) $ 265