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Note 6 - Long-term Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 07, 2020
Apr. 10, 2020
Apr. 08, 2019
Jan. 08, 2018
Aug. 31, 2020
Jun. 30, 2020
Apr. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2021
Dec. 10, 2020
May 31, 2020
Jan. 08, 2020
Mar. 27, 2018
May 04, 2016
Payments of Financing Costs, Total                       $ 6,972,000 $ 2,372,000 $ 6,490,000            
Long-term Debt, Total                       482,614,000 218,068,000              
Debt Issuance Costs, Gross                       4,500,000 2,400,000 6,500,000            
Amortization of Debt Issuance Costs                       2,100,000 1,900,000 1,900,000            
Letters of Credit Outstanding, Amount                       $ 1,200,000 $ 1,200,000              
Line of Credit Facility, Commitment Fee Percentage                       1.00% 1.00%              
Return of Paycheck Protection Program under CARES Act   $ 6,600,000         $ 6,600,000                          
Proceeds from Paycheck Protection Program Under CARES Act   $ 6,600,000         6,600,000                          
Revolving Credit Facility [Member]                                        
Long-term Line of Credit, Total               $ 45,000,000.0   $ 45,000,000.0                    
Long-term Debt, Total                       $ 44,659,000 $ 0              
Promissory Notes, Natural Habitat Acquisition [Member]                                        
Debt Instrument, Face Amount                       $ 2,500,000         $ 2,500,000     $ 2,500,000
Debt Instrument, Interest Rate, Stated Percentage                       1.44%                
Credit Agreement [Member]                                        
Debt Instrument, Deferred Financing Costs Capitalized                           4,200,000            
Debt Instrument, Covenant, Net Leverage Ratio, Maximum Unrestricted Cash and Cash Equivalents                       $ 50,000,000.0                
Debt Instrument, Covenant, Net Leverage Ratio                       5.00%                
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                           $ 1,000,000.0            
Credit Agreement [Member] | Revolving Credit Facility [Member]                                        
Line of Credit Facility, Maximum Borrowing Capacity                                     $ 45,000,000.0  
Debt Instrument, Interest Rate, Effective Percentage                       3.75%                
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] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                                        
Debt Instrument, Basis Spread on Variable Rate               0.75%                        
Credit Agreement [Member] | Letter of Credit [Member]                                        
Line of Credit Facility, Maximum Borrowing Capacity                                     5,000,000.0  
Credit Agreement [Member] | Senior Secured Term Loan Facility [Member]                                        
Debt Instrument, Face Amount                                     $ 200,000,000.0  
Debt Instrument, Increase (Decrease) in Stated Rate         1.25%                              
Debt Instrument, Interest Rate, Effective Percentage                       5.50%                
Credit Agreement [Member] | Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                                        
Debt Instrument, Basis Spread on Variable Rate                       4.75%                
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%                              
Second Export Credit Agreement [Member]                                        
Debt Instrument, Increase (Decrease) in Stated Rate 1.25%                                      
Debt Instrument, Interest Rate, Effective Percentage                       3.24%                
Debt Instrument, Covenant, Net Leverage Ratio, Maximum Unrestricted Cash and Cash Equivalents                       $ 50,000,000.0                
Debt Instrument, Covenant, Net Leverage Ratio                       5.25%                
Debt Instruments, Covenant, Net Leverage Ratio, Deduction Every Two Years                       0.25%                
Debt Agreement, Maximum Borrowing Capacity     $ 122,800,000                                  
Payments of Financing Costs, Total     $ 2,600,000 $ 2,400,000                                
Proceeds from Lines of Credit, Total             $ 30,600,000   $ 30,500,000                      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     6.36%                                  
Debt Instrument, Payments Deferred                     $ 9,000,000.0                  
Long-term Debt, Total                       $ 61,100,000                
Second Export Credit Agreement [Member] | Forecast [Member]                                        
Debt Instrument, Covenant, Net Leverage Ratio                             4.75%          
Second Export Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                                        
Debt Instrument, Basis Spread on Floating Interest Rate     3.00%                 3.00%                
Amended Credit Agreement [Member] | Senior Secured Term Loan Facility [Member] | Main Street Expanded Loan Facility Program [Member]                                        
Debt Instrument, Face Amount                       $ 85,000,000.0       $ 85,000,000        
Debt Instrument, Interest Rate, Effective Percentage                       3.24%                
Debt Instrument, Interest Amortization Rate                       15.00%                
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, Effective Percentage                       3.22%                
Debt Agreement, Maximum Borrowing Capacity       $ 107,700,000                                
Percentage of Purchase Price, Financing Maximum     80.00% 80.00%                                
Debt Instrument, Maturing over Twelve Years from Drawdown, Percentage                                   70.00%    
Debt Instrument, Maturing over Five Years from Drawdown, Percentage     30.00%                             30.00%    
Proceeds from Lines of Credit, Total                   $ 107,700,000                    
Debt Instrument, Payments Deferred           $ 9,000,000.0                            
Export Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                                        
Debt Instrument, Basis Spread on Variable Rate                       3.00%