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Note 5 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 08, 2019
Jan. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Amortization of Debt Issuance Costs and Discounts, Total     $ 500 $ 400 $ 911 $ 1,045  
Payments of Financing Costs, Total         2,340 $ 6,486  
Revolving Credit Facility [Member]              
Long-term Line of Credit, Total     $ 0   $ 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         3.25%    
Debt Instrument, Interest Rate, Effective Percentage     5.648%   5.648%    
Export Credit Agreement [Member]              
Debt Agreement, Maximum Borrowing Capacity $ 122,800 $ 107,700          
Percentage of Purchase Price, Financing Maximum 80.00% 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%          
Second Export Credit Agreement [Member]              
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.36%            
Payments of Financing Costs, Total $ 2,300            
Second 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   $ 2,500    
Debt Instrument, Interest Rate, Stated Percentage     1.44%   1.44%