Annual report pursuant to Section 13 and 15(d)

Note 1 - Significant Accounting Policies - Schedule of Other Liabilities (Long-term) (Details)

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Note 1 - Significant Accounting Policies - Schedule of Other Liabilities (Long-term) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Total other liabilities (long-term) $ 32,938 $ 9,988
Other Noncurrent Liabilities [Member]    
Dispute related to royalty deductions 5,467 4,687
Dispute related to royalty-in-kind 0 250
Lease liability (Note 7) 11,360 4,419
Derivatives 4,384 0
Black Elk escrow 11,103 0
Other $ 624 $ 632