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Note 7 - Debt - Ramaco Coal Deferred Purchase Price (Detail) $ in Thousands				1 Months Ended		12 Months Ended
	Feb. 15, 2023	Sep. 23, 2022 USD ($)	Apr. 29, 2022 USD ($) installment	Jan. 31, 2023 USD ($)	Apr. 30, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt
Outstanding principal amount						$ 90,179	$ 127,226
Current portion of long-term debt						$ 56,534	35,639
Weighted average interest rate						7.40%
Long-term Debt, Total						$ 91,383
Maben Coal LLC
Debt
Voting interest acquired		100.00%
Revolving Credit Facility
Debt
Outstanding principal amount						42,500	25,000
Maben Coal LLC
Debt
Outstanding principal amount						11,400	21,000
Current portion of long-term debt						11,400
Equipment loans
Debt
Outstanding principal amount						2,983	8,396
Current portion of long-term debt						2,600
Insurance financing
Debt
Unamortized Asset Balance with Insurance Premiums						4,000
Premium payments						$ 5,800
Term of debt						1 year
Revolving Credit Facility
Debt
Current portion of long-term debt						$ 42,500
Revolving loans under the new facility \| Secured overnight financing rate
Debt
Interest rate, basis spread	2.00%
Revolving loans under the new facility \| Base Rate
Debt
Interest rate, basis spread	1.50%
Revolving loans under the new facility \| Federal funds
Debt
Interest rate, basis spread	0.50%
Financing of Ramaco Coal acquisition - Related party debt
Debt
Aggregate principal amount			$ 55,000
Interest rate			9.00%
Number of installments \| installment			7
Frequency of periodic payment			quarterly
Outstanding principal amount							$ 40,000
Financing of Ramaco Coal acquisition - Related party debt \| 2022
Debt
Amount paid per installment			$ 5,000
Financing of Ramaco Coal acquisition - Related party debt \| 2023.
Debt
Amount paid per installment					$ 10,000
Financing of Maben Coal acquisition
Debt
Frequency of periodic payment				monthly
Financing of Maben Coal acquisition \| Secured overnight financing rate
Debt
Interest rate, basis spread		3.00%
Investec Bank PLC \| Financing of Maben Coal acquisition
Debt
Aggregate principal amount		$ 21,000				$ 11,400
Amount of monthly installments until maturity				$ 800,000