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Long-Term Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Feb. 04, 2019
Sep. 04, 2018
Aug. 18, 2015
Mar. 31, 2019
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       2.50%
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     $ 100,000,000  
Line of Credit Facility, Remaining Borrowing Capacity       $ 85,000,000
Repayments of Long-term Lines of Credit $ 5,000,000 $ 5,000,000