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Debt (Details) - Line of Credit - Revolving Credit Facility - USD ($)
6 Months Ended
Nov. 02, 2015
Jul. 31, 2020
Jan. 31, 2020
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 30,000,000    
Debt instrument, term 1 year    
Debt instrument, term, extension 1 year    
Maximum amount outstanding during period $ 30,000,000    
Commitment fee percentage 0.35%    
Line of credit, outstanding balance   $ 0 $ 0
Additional borrowing capacity $ 30,000,000    
London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis spread on variable rate   1.30%