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Long-term Debt and Other Credit Arrangements (Details) - USD ($)
Jul. 31, 2019
Apr. 30, 2019
May 06, 2013
Debt Instrument [Line Items]      
Outstanding advances under the long-term debt $ 13,300,000    
Loan agreement     $ 20,000,000
Unused and available credit facility 6,500,000 $ 5,300,000  
Advance Amount One      
Debt Instrument [Line Items]      
Outstanding advances under the long-term debt   9,500,000  
Advance Amount Two      
Debt Instrument [Line Items]      
Outstanding advances under the long-term debt $ 210,000 $ 5,200,000