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Note 10 - Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Mar. 04, 2022
Jul. 16, 2021
Jul. 15, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
COMMITMENTS AND CONTINGENCIES            
Reclamation bonding requirements       $ 25,900    
Amount of contingent liability       0    
Compensatory damages $ 1,800 $ 25,000 $ 7,700      
Asset Retirement Obligation       28,885 $ 22,549 $ 15,156
Take-or-pay Purchase Commitments            
COMMITMENTS AND CONTINGENCIES            
Commitments       5,100    
Environmental Restoration Costs [Member]            
COMMITMENTS AND CONTINGENCIES            
Regulatory Liabilities       0    
Environmental            
COMMITMENTS AND CONTINGENCIES            
Regulatory Liabilities       $ 0