Quarterly report pursuant to Section 13 or 15(d)

Contingencies (Details Textual)

v3.21.2
Contingencies (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jul. 25, 2017
USD ($)
Dec. 31, 2010
USD ($)
Additional Royalty Due to Disallowed Deductions       $ 4,700,000
Bonds Posted to Appeal IBLA Decision     $ 7,200,000  
Collateral for Bonds Posted Related to Appeal with IBLA $ 8,200,000 $ 8,200,000 $ 6,900,000  
BSEE [Member]        
Loss Contingency, Number of Claims Filed   9    
Proposed Civil Penalties   $ 7,700,000    
Settlement Agreement, Annual Instalments, Value 720,000 $ 720,000    
Payment for Civil Penalty $ 0