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Borrowings - Total Outstanding Borrowings (Parenthetical) (Details)
12 Months Ended
Nov. 07, 2019
USD ($)
Feb. 23, 2015
USD ($)
SecurityLoan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Oct. 31, 2017
USD ($)
Debt Instrument [Line Items]            
Repayments of debt     $ 1,443,000 $ 25,125,000 $ 41,279,000  
Revolving Line of Credit            
Debt Instrument [Line Items]            
Debt instrument term     13 months      
Debt instrument, maturity date     Oct. 20, 2020      
Current available credit facility     $ 50,000,000      
London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Line of Credit            
Debt Instrument [Line Items]            
Basis spread on variable rate     1.15%      
Related Party Loans Transferred to Unaffiliated Commercial Bank            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 4,700,000        
Debt instrument term   60 months        
Collateral amount       $ 1,400,000    
Repayments of debt $ 1,300          
Debt instrument, maturity date   Oct. 05, 2019        
Number of related party loans transferred | SecurityLoan   2        
Related Party Loans Transferred to Unaffiliated Commercial Bank | Prime Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.00%        
Financing Lease with Unaffiliated Lease Company | Financing Lease Obligations            
Debt Instrument [Line Items]            
Financing lease obligations, noncurrent           $ 19,000
Term of contract           60 months
Option to purchase equipment, amount           $ 1.00