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INTEREST (EXPENSE) INCOME, NET (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
INTEREST (EXPENSE) INCOME, NET        
Interest income on savings $ 2 $ 26 $ 10 $ 127
Interest income on notes 0 0 1 0
Interest on deferred purchase price 0 32 0 196
Interest expense (23) 0 (38) 0
Interest income, net $ (21) $ 58 $ (27) $ 323