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Subsequent Event (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Aug. 03, 2018
Subsequent Event [Line Items]    
Line of credit   $ 10.0
Aggregate Borrowings   25.0
Total aggregate principal amount of loans   $ 35.0
Revolving credit facility | Wells Fargo Bank | Subsequent Event    
Subsequent Event [Line Items]    
Line of credit $ 25.0  
Aggregate Borrowings 30.0  
Total aggregate principal amount of loans $ 55.0  
Maximum leverage Ratio 3.00%  
Minimum cash and cash equivalents $ 5.0  
Revolving credit facility | Wells Fargo Bank | Subsequent Event | Federal Funds    
Subsequent Event [Line Items]    
Basis spread (as a percent) 0.50%  
Revolving credit facility | Wells Fargo Bank | Subsequent Event | Base Rate    
Subsequent Event [Line Items]    
Basis spread (as a percent) 1.00%  
Revolving credit facility | Wells Fargo Bank | Subsequent Event | Maximum    
Subsequent Event [Line Items]    
Unused line fee (as a percent) 0.375%  
Revolving credit facility | Wells Fargo Bank | Subsequent Event | Maximum | Base Rate    
Subsequent Event [Line Items]    
Basis spread (as a percent) 1.40%  
Revolving credit facility | Wells Fargo Bank | Subsequent Event | Maximum | LIBOR    
Subsequent Event [Line Items]    
Basis spread (as a percent) 2.40%  
Revolving credit facility | Wells Fargo Bank | Subsequent Event | Minimum    
Subsequent Event [Line Items]    
Unused line fee (as a percent) 0.30%  
Revolving credit facility | Wells Fargo Bank | Subsequent Event | Minimum | Base Rate    
Subsequent Event [Line Items]    
Basis spread (as a percent) 0.65%  
Revolving credit facility | Wells Fargo Bank | Subsequent Event | Minimum | LIBOR    
Subsequent Event [Line Items]    
Basis spread (as a percent) 1.65%