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Note 4 - Acquisitions (Details)
a in Thousands, $ in Thousands, MT in Millions
 1 Months Ended 12 Months Ended
Sep. 23, 2022
USD ($)
a
Apr. 29, 2022
USD ($)
a
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
MT
Asset Acquisition          
Fair value of assets     $ 227,077 $ 429,842 $ 227,077
Payment of cash bond replacement obligation       $ 1,200  
Maben Coal, LLC          
Asset Acquisition          
Voting interest acquired 100.00%        
Ramaco Coal Asset Acquisition          
Asset Acquisition          
Purchase price   $ 65,000      
Initial payment   10,000      
Deferred purchase price payable due in remainder of 2022   55,000      
Quarterly Installment amount in remainder of 2022   5,000      
Quarterly Installment amount in remainder of 2023   $ 10,000      
Interest rate (as a percent)   9.00%      
Area of thermo coal deposit Wyoming | a   16      
Upfront payment receivable on royalty   $ 2,000      
Minimum quarterly royalty payment receivable   125      
Fair value of acquisition   3,700      
Reduction in purchase price payable   1,600      
Gain on sale of mineral rights   2,100      
Consideration paid   68,300      
Closing cost on asset acquisition   1,600      
Relinquishment cost on prepaid royalties   1,600      
Amount paid to a mineral owner as part of the acquisition   100      
Ramaco Coal Asset Acquisition | Mining property and mineral rights          
Asset Acquisition          
Fair value of assets   65,100      
Ramaco Coal Asset Acquisition | Building          
Asset Acquisition          
Fair value of assets   2,600      
Ramaco Coal Asset Acquisition | Equipment          
Asset Acquisition          
Fair value of assets   $ 600      
Maben Coal, LLC          
Asset Acquisition          
Purchase price $ 30,000        
Initial payment $ 9,000        
Area of Real Estate Property | a 28        
Consideration paid $ 33,000        
Closing cost on asset acquisition 1,700        
Liabilities recognized 1,300        
Amount of cash bond replacement obligations incurred by the Company as part of the transaction 1,200        
Aggregate principal amount 21,000        
Maben Coal, LLC | Mining property and mineral rights          
Asset Acquisition          
Consideration paid 30,600        
Maben Coal, LLC | Capitalized mine development cost          
Asset Acquisition          
Consideration paid 1,000        
Maben Coal, LLC | Cash bond replacement          
Asset Acquisition          
Consideration paid 1,200        
Maben Coal, LLC | Recoupable royalties          
Asset Acquisition          
Consideration paid $ 200        
Coronado Global Resources Inc.          
Asset Acquisition          
Purchase price     $ 30,000    
Asset acquisition, capacity of coal preparation plant | MT         1.3