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Note 6 - Leases (Details Textual)
12 Months Ended 24 Months Ended
Dec. 10, 2020
USD ($)
Dec. 10, 2020
USD ($)
Dec. 20, 2019
Mar. 31, 2015
USD ($)
Jan. 29, 2015
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2022
USD ($)
Payments to Acquire Property, Plant, and Equipment, Total             $ (0) $ 48,140,000 $ (0)    
Operating Lease, Right-of-Use Asset             $ 45,222,000 0      
Operating Lease, Weighted Average Remaining Lease Term (Month)             59 months 6 days        
M/T Eco Bel Air and M/T Eco Beverly Hills [Member]                      
Number of Time Charters             2        
M/T Nord Valiant [Member]                      
Number of Time Charters             1        
M/T Eco Los Angeles and M/T Eco City of Angels [Member]                      
Number of Time Charters             2        
M/T Eco Marina Del Ray [Member]                      
Number of Time Charters             1        
M/T Stenaweco Energy and M/T Stenaweco Evolution Sale Leaseback [Member]                      
Sale Leaseback Transaction, Lease Term (Year)       7 years              
M/T Stenaweco Energy Sale Leaseback [Member]                      
Sale Leaseback Transaction, Rent Expense, Per Day       $ 8,625 $ 8,586            
M/T Stenaweco Energy, M/T Stenaweco Evolution, and M/T Stenaweco Excellence [Member]                      
Sale Leaseback Transaction, Buyback Period, Minimum Term (Year)       3 years              
Sale Leaseback Transaction, Buyback Period, Maximum Term (Year)       7 years              
M/T Stenaweco Energy and the M/T Stenaweco Evolution [Member]                      
Number of Vessel Purchase Options Exercised     2                
M/T Stenaweco Energy [Member]                      
Payments to Acquire Property, Plant, and Equipment, Total               $ 24,063,000 $ 23,871,000    
M/T Eco Beverly Hills and M/T Eco Bel Air [Member]                      
Sale Leaseback Transaction, Lease Term (Year)   5 years                  
Sale Leaseback Transaction, Minimum Liquidity Requirement           $ 4,000,000          
Operating Lease, Right-of-Use Asset $ 45,425,000 $ 45,425,000                  
Operating Lease, Liability, Total 43,759,000 $ 43,759,000                  
Operating Lease, Cost 1,666,000                    
Sale and Leaseback Transaction, Gain (Loss), Net $ (340,000)           $ (10,688,000)        
Lessee, Operating Lease, Discount Rate 6.72% 6.72%                  
Operating Lease, Payments             $ 877,000        
M/T Eco Beverly Hills and M/T Eco Bel Air [Member] | Forecast [Member]                      
Sale Leaseback Transaction, Rent Expense, Per Day           $ 10,000       $ 14,000 $ 16,750