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Note 12 - Properties and Equipment, Accrued Expenses, Other Current Liabilities, and Other Liabilities (Details Textual)
$ in Millions
 6 Months Ended 12 Months Ended
Mar. 07, 2023
Jun. 30, 2023
USD ($)
Dec. 31, 2022
Jun. 30, 2022
Number of Vessels   184 183  
Number of Vessels, Held for Sale   2 8 9
Solstad Offshore ASA [Member]        
Number Of Offshore Supply Vessels 37      
Alucat Crew Boats [Member]        
Number of Vessels   5    
Down Payment To Start Construction On Crew Boats   $ 2.8    
Expected cost of Boats   $ 11.3