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Note 15 - Subsequent Events (Details)
$ / shares in Units, $ in Thousands
1 Months Ended
Mar. 04, 2022
USD ($)
Feb. 23, 2022
USD ($)
Feb. 18, 2022
USD ($)
$ / shares
Feb. 17, 2022
USD ($)
Jul. 16, 2021
USD ($)
Jul. 15, 2021
USD ($)
Dec. 31, 2021
USD ($)
Subsequent Events              
Quarterly Dividend             $ 2,500
Compensatory damages $ 1,800       $ 25,000 $ 7,700  
Dividend payable             $ 2,501
Subsequent Event              
Subsequent Events              
Quarterly Dividend     $ 5,000        
Percentage of increase in quarterly dividend     100        
Dividends     $ 20,000 $ 10,000      
Dividend payable per share | $ / shares     $ 0.45        
Quarterly dividend per share | $ / shares     $ 0.11        
Subsequent Event | Ramaco Coal, LLC              
Subsequent Events              
Voting interest acquired   100.00%          
Purchase price   $ 65,000          
Consideration to be paid   5,000          
Deferred consideration   $ 60,000