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Note 4 - Debt (Details Textual)
$ in Thousands, € in Millions, kr in Millions
12 Months Ended 36 Months Ended
Jul. 05, 2023
USD ($)
Nov. 16, 2021
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
NOK (kr)
Dec. 31, 2023
EUR (€)
Jul. 03, 2023
USD ($)
Dec. 31, 2020
USD ($)
Jul. 31, 2017
USD ($)
Long-Term Debt, Current Maturities     $ 103,077 $ 0              
Gain (Loss) on Extinguishment of Debt, Total     0 0 $ (11,100)            
Revolving Credit Facility [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity   $ 25,000                  
Long-term Line of Credit, Total     0                
Debt Instrument, Mandatory Prepayment, Minimum Aggregate Nominal Amount Outstanding   $ 75,000                  
Prime Rate [Member] | Revolving Credit Facility [Member]                      
Debt Instrument, Basis Spread on Variable Rate   4.00%                  
Nordic Bond [Member]                      
Debt Instrument, Face Amount   $ 175,000                  
Debt Instrument, Fair Value Disclosure     181,700                
Debt Instrument, Interest Rate, Stated Percentage   8.50%                  
Debt Instrument, Issue Price Percentage   98.50%                  
Debt Instrument, Monthly Deposit into Reserve Account, Percentage of Interest Payment   16.67%                  
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%                  
The 8.00% Senior Secured Notes due August 2022 [Member]                      
Debt Instrument, Face Amount                     $ 350,000
Long-Term Debt, Gross     $ 175,000 $ 175,000              
Debt Instrument, Interest Rate, Stated Percentage   8.00% 8.50% 8.50%       8.50%     8.00%
Gain (Loss) on Extinguishment of Debt, Total   $ (11,100)                  
Repayments of Debt         11,800            
Supplier Facility Agreements [Member]                      
Debt Instrument, Face Amount     $ 15,200         € 13.9      
Long-Term Debt, Gross     $ 14,151 $ 0              
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%      
NOK Denominated Notes Due May 2024 and January 2026 [Member] | Troms Offshore [Member]                      
Debt Instrument, Term (Year)             12 years        
NOK Denominated Notes Due January 2026 [Member] | Troms Offshore [Member]                      
Debt Instrument, Face Amount | kr             kr 504.4        
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member]                      
Debt Instrument, Face Amount           $ 60,800          
Debt Instrument, Term (Year)           12 years          
USD Denominated Notes Due January 2027 [Member] | Maximum [Member] | Troms Offshore [Member]                      
Capitalization Rate           6.13%          
USD Denominated Notes Due January 2027 [Member] | Minimum [Member] | Troms Offshore [Member]                      
Capitalization Rate           4.56%          
Secured Debt [Member]                      
Debt Instrument, Face Amount $ 325,000                    
Long-Term Debt, Gross 318,300   $ 312,500 0              
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%                    
Debt Instrument, Fair Value Disclosure     313,700                
Secured Debt [Member] | Tranche A Term Loan [Member]                      
Debt Instrument, Face Amount $ 100,000                    
Long-Term Debt, Current Maturities 50,000                    
Long-Term Line of Credit, Noncurrent $ 50,000                    
Secured Debt [Member] | Tranche A Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate 5.00%                    
Secured Debt [Member] | Tranche A Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Maximum [Member]                      
Debt Instrument, Basis Spread on Variable Rate 8.00%                    
Secured Debt [Member] | Tranche B Term Loan [Member]                      
Debt Instrument, Face Amount $ 225,000                    
Debt Instrument, Term (Year) 3 years                    
Secured Debt [Member] | Tranche B Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate 3.75%                    
Unsecured Debt [Member]                      
Debt Instrument, Face Amount                 $ 250,000    
Long-Term Debt, Gross     250,000 $ 0         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%    
Debt Instrument, Fair Value Disclosure     $ 260,200                
Debt Instrument, Interest Rate, Stated Percentage     10.375%         10.375% 10.375%    
Senior Notes [Member] | Troms Offshore [Member] | Plan Of Reorganization [Member]                      
Debt Instrument, Covenant, Obligation to Prepay, Additional Amount, Maximum                   $ 45,000  
Repayments of Long-term Debt, Total         $ 23,300