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Note 5 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Apr. 30, 2021
Aug. 31, 2020
Apr. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Apr. 30, 2019
Mar. 31, 2018
Jan. 31, 2018
May 31, 2016
Amortization of Debt Issuance Costs               $ 800 $ 500     $ 2,300 $ 1,500          
Long-term Debt, Gross $ 561,760             561,760   $ 561,760 $ 561,760 561,760   $ 496,492        
Revolving Credit Facility [Member]                                    
Long-term Line of Credit, Total           $ 45,000                        
Long-term Debt, Gross $ 45,000             $ 45,000   $ 45,000 $ 45,000 $ 45,000   45,000        
Credit Agreement [Member] | Revolving Credit Facility [Member]                                    
Line of Credit Facility, Maximum Borrowing Capacity                               $ 45,000    
Debt Instrument, Interest Rate, Effective Percentage 3.58%             3.58%   3.58% 3.58% 3.58%            
Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                                    
Debt Instrument, Basis Spread on Variable Rate                       3.50%            
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, Interest Rate, Increase (Decrease)       1.25%                            
Debt Instrument, Interest Rate Spreads, Increase (Decrease)     0.50%                              
Credit Agreement [Member] | Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                                    
Debt Instrument, Basis Spread on Variable Rate                       5.25%            
Debt Instrument, Interest Rate, Effective Percentage 6.00%             6.00%   6.00% 6.00% 6.00%            
Credit Agreement [Member] | Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                                    
Debt Instrument, Basis Spread on Variable Rate       0.75%               0.75%            
Amended Credit Agreement [Member] | Senior Secured Term Loan Facility [Member] | Main Street Expanded Loan Facility Program [Member]                                    
Debt Instrument, Face Amount                           $ 85,000        
Debt Instrument, Interest Amortization Rate                           15.00%        
Debt Instrument, Interest Rate, Effective Percentage 3.13%             3.13%   3.13% 3.13% 3.13%            
Amended Credit Agreement [Member] | Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Main Street Expanded Loan Facility Program [Member]                                    
Debt Instrument, Basis Spread on Variable Rate                       3.00%            
Export Credit Agreement [Member]                                    
Debt Instrument, Interest Rate Spreads, Increase (Decrease)   0.50%                                
Debt Instrument, Interest Rate, Effective Percentage 3.62%             3.62%   3.62% 3.62% 3.62%            
Debt Agreement, Maximum Borrowing Capacity                                 $ 107,700  
Percentage of Purchase Price, Financing Maximum                             80.00%   80.00%  
Proceeds from Issuance of Debt           $ 107,700                        
Export Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                                    
Debt Instrument, Basis Spread on Variable Rate                       3.50%            
First Export Credit Facility [Member]                                    
Debt Instrument, Interest Rate Spreads, Increase (Decrease)   0.50%                                
Long-Term Debt, Aggregate Amount Deferred for Future Payments   $ 15,700                                
Second Export Credit Agreement [Member]                                    
Debt Instrument, Basis Spread on Variable Rate                   3.50%                
Debt Instrument, Interest Rate, Effective Percentage 3.63%             3.63%   3.63% 3.63% 3.63%            
Debt Agreement, Maximum Borrowing Capacity                             $ 122,800      
Proceeds from Issuance of Debt $ 46,200   $ 15,500   $ 30,600   $ 30,500       $ 61,700              
Long-term Debt, Gross 122,800             $ 122,800   $ 122,800 122,800 $ 122,800            
Promissory Notes, Natural Habitat Acquisition [Member]                                    
Debt Instrument, Face Amount                                   $ 2,500
Long-term Debt, Gross $ 1,700             $ 1,700   $ 1,700 $ 1,700 $ 1,700            
Debt Instrument, Interest Rate, Stated Percentage 1.44%             1.44%   1.44% 1.44% 1.44%