Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Contingencies (Details Textual)

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Note 11 - Contingencies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Jul. 25, 2017
Jan. 27, 2017
Dec. 31, 2010
Additional Royalty Due to Disallowed Deductions       $ 4,700 $ 4,700
Bonds Posted to Appeal IBLA Decision     $ 7,200    
Collateral for Bonds Posted Related to Appeal with IBLA     $ 6,900    
BSEE [Member]          
Payment for Civil Penalty $ 0 $ 0      
Proposed Civil Penalties 7,700        
Loss Contingency Accrual, Ending Balance $ 3,500 $ 3,500