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Note 7 - Commitments and Contingencies (Details)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 04, 2022
USD ($)
Jul. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
contract
Settled Litigation        
COMMITMENTS AND CONTINGENCIES        
Amount of award   $ 25.0 $ 7.7  
Amount of award reduction $ 1.8      
Surety Bond        
COMMITMENTS AND CONTINGENCIES        
Asset Retirement Obligation       $ 20.8
Reclamation bonding requirements       0.3
Take-or-pay Purchase Commitments        
COMMITMENTS AND CONTINGENCIES        
Commitments       $ 12.8
Number of contracts | contract       3