Annual report pursuant to Section 13 and 15(d)

Note 9 - Derivative Financial Instruments - Fair Value of Open and Closed Contracts Which Had Not Yet Settled (Details)

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Note 9 - Derivative Financial Instruments - Fair Value of Open and Closed Contracts Which Had Not Yet Settled (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Prepaid and other assets – current [1] $ 2,752       $ 7,266       $ 2,752 $ 7,266  
Other assets – non-current 2,762       2,653       2,762 2,653  
Derivative loss (gain) 11,500 $ 11,200 $ 15,400 $ (61,900) 18,700 $ (5,900) $ (1,800) $ 48,900 (23,808) 59,887 $ (53,798)
Accrued Liabilities [Member]                      
Derivatives 13,620       1,785       13,620 1,785  
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member]                      
Prepaid and other assets – current 2,752       7,266       2,752 7,266  
Other assets – non-current 2,762       2,653       2,762 2,653  
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member] | Accrued Liabilities [Member]                      
Derivatives $ 13,620       $ 1,785       $ 13,620 $ 1,785  
[1] Includes both open and closed contracts.