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Long-Term Debt (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Nov. 03, 2017
Oct. 05, 2017
Sep. 04, 2018
Aug. 18, 2015
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]            
Amortization of Acquisition Costs         $ 266,000  
Amortization Of Additional Acquisition Costs         $ 120,000  
London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Effective Percentage         0.25%  
Maximum [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Commitment Fee Percentage         0.30%  
Maximum [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate         1.00%  
Minimum [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Commitment Fee Percentage         0.20%  
Minimum [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate         0.00%  
Libor Rate [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Effective Percentage         2.31%  
Libor Rate [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate         2.00%  
Libor Rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate         1.00%  
Revolving credit facility [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Maturity Date       Aug. 18, 2020    
Long-term Debt, Total       $ 100,000,000 $ 20,000,000 $ 25,000,000
Line of Credit Facility, Remaining Borrowing Capacity         $ 80,000,000  
Repayments of Long-term Lines of Credit $ 5,000,000 $ 5,287,000 $ 5,000,000