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Note 5 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Amortization of Debt Issuance Costs and Discounts, Total   $ 434 $ 608
Revolving Credit Facility [Member]      
Long-term Line of Credit, Total   $ 0  
Credit Agreement [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     45,000
Credit Agreement [Member] | Letter of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     5,000
Credit Agreement [Member] | Senior Secured Term Loan Facility [Member]      
Debt Instrument, Face Amount     200,000
Credit Agreement [Member] | Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate   3.50%  
Debt Instrument, Interest Rate, Effective Percentage   5.99%  
Export Credit Agreement [Member]      
Debt Agreement, Maximum Borrowing Capacity $ 107,700    
Percentage of Purchase Price, Financing Maximum 80.00%    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 5.78%    
Export Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 3.00%    
Promissory Notes, Natural Habitat Acquisition [Member]      
Debt Instrument, Face Amount     $ 2,500
Debt Instrument, Interest Rate, Stated Percentage     1.44%