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Long-term Debt and Other Credit Arrangements (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Apr. 30, 2020
Debt Instrument [Line Items]    
Unused and available credit facility $ 6,000 $ 8,700
Advance Amount One    
Debt Instrument [Line Items]    
Outstanding advances under the long-term debt 8,500 4,700
Advance Amount Two    
Debt Instrument [Line Items]    
Outstanding advances under the long-term debt $ 512 $ 512