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Long-term Debt and Other Credit Arrangements (Details) - USD ($)
Feb. 01, 2020
Dec. 13, 2019
Oct. 31, 2019
Apr. 30, 2019
May 06, 2013
Debt Instrument [Line Items]          
Outstanding advances under the long-term debt     $ 6,800,000    
Loan agreement         $ 20,000,000
Unused and available credit facility     12,900,000 $ 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     $ 344,000 $ 5,200,000  
Subsequent Event          
Debt Instrument [Line Items]          
Collateralized debt instrument, borrowing capacity $ 15,000,000 $ 20,000,000