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Long-term Debt and Other Credit Arrangements (Details) - USD ($)
Feb. 01, 2020
Jan. 31, 2020
Dec. 13, 2019
Apr. 30, 2019
Debt Instrument [Line Items]        
Outstanding advances under the long-term debt   $ 3,300,000    
Remaining borrowing capacity   10,200,000   $ 5,300,000
Collateralized debt instrument, borrowing capacity $ 15,000,000   $ 20,000,000  
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   $ 344,000   $ 5,200,000