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Note 4 - Long-term Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 4 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Term Loan [Member]        
Debt Instrument, Interest Rate, Stated Percentage     12.20%
Write off of Unamortized Discount $ 600,000      
Write off of Deferred Debt Issuance Cost 5,300,000      
Debt Instrument, Interest Rate, Effective Percentage       12.20%
Debt Instrument, Unamortized Discount, Total       $ 800,000
Term Loan [Member] | Lender 1 [Member]        
Payment for Debt Extinguishment or Debt Prepayment Cost 1,400,000      
Term Loan [Member] | Third Party [Member]        
Payment for Debt Extinguishment or Debt Prepayment Cost 100,000      
Credit Facility [Member]        
Line of Credit Facility Additional Borrowing Capacity Available 75,000,000      
Line of Credit Facility, Swingline Sub Facility, Maximum Borrowing Capacity 15,000,000      
Credit Facility [Member] | Prime Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate     1.25%  
Credit Facility [Member] | Prime Rate [Member] | Scenario, Forecast [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.75%    
Credit Facility [Member] | Prime Rate [Member] | Scenario, Forecast [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.50%    
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate     2.25%  
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.75%    
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate   2.50%    
Credit Facility [Member] | Term Facility [Member]        
Debt Instrument, Face Amount $ 200,000,000      
Credit Facility [Member] | Term Facility [Member] | Minimum [Member]        
Debt Instrument, Interest Rate, Stated Percentage 1.25%      
Credit Facility [Member] | Term Facility [Member] | Maximum [Member]        
Debt Instrument, Interest Rate, Stated Percentage 2.50%      
Revolving Credit Facility [Member] | Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 150,000,000      
Long-term Line of Credit, Total     $ 0  
Line of Credit Facility, Remaining Borrowing Capacity     112,500,000  
Revolving Credit Facility [Member] | Credit Facility [Member] | Minimum [Member]        
Line of Credit Facility, Commitment Fee Percentage 0.25%      
Revolving Credit Facility [Member] | Credit Facility [Member] | Maximum [Member]        
Line of Credit Facility, Commitment Fee Percentage 0.35%      
Letter of Credit [Member] | Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 75,000,000      
Line of Credit [Member]        
Letters of Credit Outstanding, Amount     $ 37,500,000 $ 34,500,000
Write off of Deferred Debt Issuance Cost 200,000      
Payment for Debt Extinguishment or Debt Prepayment Cost $ 100,000