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Note 6 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 08, 2019
Mar. 27, 2018
Jan. 08, 2018
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2020
Jan. 31, 2018
May 04, 2016
Line of Credit Facility, Commitment Fee Percentage         1.00% 1.00%        
Payments of Financing Costs, Total         $ 2,372 $ 6,490 $ 418      
Debt Issuance Costs, Gross         2,400 6,500 400      
Amortization of Debt Issuance Costs         1,900 1,900 $ 2,200      
Letters of Credit Outstanding, Amount         $ 1,200 1,200        
Revolving Credit Facility [Member]                    
Long-term Line of Credit, Total       $ 0            
Promissory Notes, Natural Habitat Acquisition [Member]                    
Debt Instrument, Face Amount                   $ 2,500
Debt Instrument, Interest Rate, Stated Percentage                   1.44%
Credit Agreement [Member]                    
Debt Instrument, Deferred Financing Costs Capitalized           4,200        
Debt Instrument, Covenant, Net Leverage Ratio, Maximum Unrestricted Cash and Cash Equivalents   $ 50,000                
Debt Instrument, Covenant, Net Leverage Ratio   5.25%                
Debt Instruments, Covenant, Net Leverage Ratio, Deduction Every Two Years   0.25%                
Credit Agreement [Member] | Forecast [Member]                    
Debt Instrument, Covenant, Net Leverage Ratio               4.75%    
Credit Agreement [Member] | General and Administrative Expense [Member]                    
Debt Instrument, Debt Refinance Costs Expensed           $ 1,000        
Credit Agreement [Member] | Revolving Credit Facility [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity   $ 45,000                
Line of Credit Facility, Commitment Fee Percentage         0.50%          
Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument, Basis Spread on Variable Rate         3.00%          
Credit Agreement [Member] | Revolving Credit Facility [Member] | Base Rate [Member]                    
Debt Instrument, Basis Spread on Variable Rate         2.00%          
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                
Debt Instrument, Increase (Decrease), Net, Total   $ 25,000                
Debt Instrument, Interest Rate, Effective Percentage         5.01%          
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, Basis Spread on Variable Rate, Contingent on Debt Rating         3.50%          
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%  
Debt Instrument, Maturing over Twelve Years from Drawdown, Percentage     70.00%              
Debt Instrument, Maturing over Five Years from Drawdown, Percentage     30.00%              
Export Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument, Basis Spread on Variable Rate 3.00%   3.00%   4.98%          
Second Export Credit Agreement [Member]                    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.36%                  
Payments of Financing Costs, Total $ 2,300                  
Proceeds from Issuance of Debt       $ 30,500            
Second Export Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument, Basis Spread on Variable Rate 3.00%                  
Export Credit Agreement and Second Export Credit Agreement [Member]                    
Debt Instrument, Covenant, Net Leverage Ratio, Maximum Unrestricted Cash and Cash Equivalents $ 50,000                  
Debt Instrument, Covenant, Net Leverage Ratio 5.25%