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Debt Obligations (Details) - USD ($)
Nov. 06, 2018
Sep. 30, 2019
Jun. 30, 2019
Line of Credit Facility      
Long-term borrowings under revolving credit facility   $ 85,000,000 $ 92,000,000
Revolving Credit Facility      
Line of Credit Facility      
Long-term borrowings under revolving credit facility   $ 85,000,000 $ 92,000,000
Debt, weighted average interest rate   4.06% 3.98%
JP Morgan Chase | Amended Credit Agreement [Member] | Revolving Credit Facility | Minimum      
Line of Credit Facility      
Line of credit, commitment fee percent 0.20%    
JP Morgan Chase | Amended Credit Agreement [Member] | Revolving Credit Facility | Maximum      
Line of Credit Facility      
Line of credit, commitment fee percent 0.40%    
JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility      
Line of Credit Facility      
Line of credit, maximum borrowing capacity $ 150,000,000    
Line of Credit Facility, Revolving Loan Commitment, Accordion Feature 75,000,000    
JP Morgan Chase | JPM Chase Loan Agreement | Swing Line Loans      
Line of Credit Facility      
Line of credit, maximum borrowing capacity $ 15,000,000    
Prime Rate | JP Morgan Chase | Minimum      
Line of Credit Facility      
Line of credit, description of interest rate PRIME + 0.25%    
Prime Rate | JP Morgan Chase | Maximum      
Line of Credit Facility      
Line of credit, description of interest rate PRIME + 0.875%    
London Interbank Offered Rate (LIBOR) | JP Morgan Chase | Minimum      
Line of Credit Facility      
Line of credit, description of interest rate Adjusted LIBO Rate + 1.25%    
London Interbank Offered Rate (LIBOR) | JP Morgan Chase | Maximum      
Line of Credit Facility      
Line of credit, description of interest rate Adjusted LIBO Rate + 1.875%    
Option One [Member] | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility      
Line of Credit Facility      
Debt Instrument, Description of Variable Rate Basis Prime Rate    
Option One [Member] | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility | Minimum      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 0.25%    
Option One [Member] | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility | Maximum      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 0.875%    
Option Two [Member] | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility      
Line of Credit Facility      
Debt Instrument, Description of Variable Rate Basis LIBOR Rate    
Option Two [Member] | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility | Minimum      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 1.25%    
Option Two [Member] | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility | Maximum      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 1.875%