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Borrowings (Loan Agreement) (Details) - Line of Credit - JPMorgan Chase Bank, N.A. - Revolving Credit Facility
Dec. 31, 2019
Sep. 30, 2019
USD ($)
Mar. 29, 2019
USD ($)
Line of Credit Facility [Line Items]      
Maximum revolving secured credit line     $ 40,000,000.0
Borrowing rate under agreement, at period end   4.10%  
Amount outstanding   $ 20,600,000  
Avaiable for borrowing under line of credit   $ 12,700,000  
Scenario, Forecast      
Line of Credit Facility [Line Items]      
Fixed charge cover ratio, minimum 1.10