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Credit Facilities - Loan Facilities and Subordinated Debt (Details) - USD ($)
3 Months Ended
Dec. 31, 2017
Sep. 30, 2017
London Interbank Offered Rate (LIBOR) [Member]    
Line of Credit Facility [Line Items]    
Interest rate (percent) 1.69%  
Term Loans    
Line of Credit Facility [Line Items]    
Maximum availability $ 25,000,000  
Term Loans | London Interbank Offered Rate (LIBOR) [Member]    
Line of Credit Facility [Line Items]    
Basis spread on loan 3.00%  
Term Loans | Term Loan with Fifth Third Bank    
Line of Credit Facility [Line Items]    
Maximum availability $ 25,000,000.0  
Number of equal installment payments 59 months  
Periodic principal payment $ 312,500  
Line of Credit    
Line of Credit Facility [Line Items]    
Maximum availability $ 10,000,000  
Line of Credit | London Interbank Offered Rate (LIBOR) [Member]    
Line of Credit Facility [Line Items]    
Basis spread on loan 3.00%  
Notes Payable to Banks [Member]    
Line of Credit Facility [Line Items]    
Loan balance $ 18,750,000 $ 19,688,000
Notes Payable to Banks [Member] | Term Loans    
Line of Credit Facility [Line Items]    
Loan balance 18,800,000  
Notes Payable to Banks [Member] | Line of Credit    
Line of Credit Facility [Line Items]    
Loan balance $ 0