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Note 8 - Debt (Details Textual)
$ in Thousands, € in Millions
Jul. 05, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2024
EUR (€)
Dec. 31, 2023
USD ($)
Jul. 03, 2023
USD ($)
Nov. 16, 2021
USD ($)
Restricted Cash, Current   $ 3,527   $ 1,241    
Long-Term Debt, Gross   724,767   751,651    
Long-Term Debt, Current Maturities   102,993   103,077    
Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity           $ 25,000
Long-Term Line of Credit   0        
Nordic Bond [Member]            
Long-Term Debt, Fair Value   $ 182,300   181,700    
Debt Instrument, Interest Rate, Stated Percentage   8.50% 8.50%     8.50%
Restricted Cash, Current   $ 1,200        
Debt Instrument, Covenant, Minimum Free Liquidity Amount           $ 20,000
Debt Instrument, Covenant, Minimum Free Liquidity, Percentage of Net Interest Bearing Debt           10.00%
Debt Instrument, Covenant, Percentage of Minimum Equity Ratio           30.00%
Nordic Bond [Member] | GOLP and TMII [Member]            
Debt Instrument, Collateral, Percentage of Equity Interests           66.00%
Supplier Facility Agreements [Member]            
Debt Instrument, Face Amount   15,200 € 13.9      
Long-Term Debt, Gross   $ 12,267   14,151    
Supplier Facility Agreements [Member] | Maximum [Member]            
Debt Instrument, Interest Rate, Stated Percentage   6.30% 6.30%      
Supplier Facility Agreements [Member] | Minimum [Member]            
Debt Instrument, Interest Rate, Stated Percentage   2.70% 2.70%      
Secured Debt [Member]            
Long-Term Debt, Fair Value   $ 295,100   313,700    
Debt Instrument, Face Amount $ 325,000          
Long-Term Debt, Gross 318,300 287,500   312,500    
Debt Instrument, Covenant, Free Liquidity Test, Amount $ 20,000          
Debt Instrument, Covenant, Free Liquidity Test, Percentage 10.00%          
Debt Instrument, Covenant, Minimum Equity Ratio 30.00%          
Secured Debt [Member] | Tranche A Term Loan [Member]            
Long-Term Debt, Current Maturities $ 50,000          
Long-Term Line of Credit, Noncurrent $ 50,000          
Debt Instrument, Basis Spread on Variable Rate 5.00%          
Secured Debt [Member] | Tranche A Term Loan [Member] | Maximum [Member]            
Debt Instrument, Basis Spread on Variable Rate 8.00%          
Secured Debt [Member] | Tranche B Term Loan [Member]            
Debt Instrument, Term (Year) 3 years          
Debt Instrument, Basis Spread on Variable Rate 3.75%          
Unsecured Debt [Member]            
Long-Term Debt, Fair Value   $ 269,100   260,200    
Debt Instrument, Interest Rate, Stated Percentage 10.375% 10.375% 10.375%   10.375%  
Debt Instrument, Face Amount         $ 250,000  
Long-Term Debt, Gross   $ 250,000   $ 250,000 243,100  
Debt Instrument, Covenant, Free Liquidity Test, Amount         $ 20,000  
Debt Instrument, Covenant, Free Liquidity Test, Percentage         10.00%  
Debt Instrument, Covenant, Minimum Equity Ratio         30.00%