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Note 10 - Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 04, 2022
Jul. 16, 2021
Jul. 15, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
COMMITMENTS AND CONTINGENCIES            
Asset Retirement Obligation       $ 22,549 $ 15,156 $ 14,605
Reclamation bonding requirements       16,800    
Reclamation bonding requirements       300    
Amount of award $ 1,800 $ 25,000 $ 7,700      
Take-or-pay Purchase Commitments            
COMMITMENTS AND CONTINGENCIES            
Commitments       13,200    
Environmental Restoration Costs [Member]            
COMMITMENTS AND CONTINGENCIES            
Regulatory Liabilities       0    
Environmental            
COMMITMENTS AND CONTINGENCIES            
Regulatory Liabilities       $ 0