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Note 4 - Debt (Details) $ in Thousands				3 Months Ended	9 Months Ended
Note 4 - Debt (Details) $ in Thousands	Sep. 23, 2022 USD ($)	Apr. 29, 2022 USD ($) installment	Jul. 13, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) installment	Sep. 30, 2021 USD ($)	Oct. 23, 2022	Jan. 11, 2022 USD ($)	Dec. 31, 2021 USD ($)	Nov. 24, 2021 USD ($)	Oct. 29, 2021 USD ($)	Oct. 28, 2021 USD ($)	Aug. 16, 2021 USD ($)	Jul. 23, 2021 USD ($)	Apr. 16, 2020 USD ($)
Debt
Debt issuance costs incurred						$ 2,356
Current portion of long-term debt				$ 30,839	$ 30,839				$ 7,674
Maben Coal, LLC
Debt
Aggregate principal amount	$ 21,000
Maben Coal, LLC
Debt
Voting interest acquired	100.00%						100.00%
Senior Notes.
Debt
Aggregate principal amount			$ 34,500	$ 34,500	$ 34,500
Debt issuance costs incurred			$ 2,400
Effective interest rate				10.45%	10.45%
Interest rate			9.00%	9.00%	9.00%
Unamortized premium/discount				$ 1,800	$ 1,800
Redemption price percentage					100.00%
Ramaco Coal Loan
Debt
Aggregate principal amount		$ 55,000
Amount paid per installment		$ 10,000
Number of installments \| installment		7
Frequency of periodic payment		quarterly
Interest rate		9.00%
Outstanding principal amount				45,000	$ 45,000
Ramaco Coal Loan \| Maximum
Debt
Percentage available for conversion		50.00%
Amount available for conversion		$ 30,000
Ramaco Coal Loan \| Initial Period For Periodic Payments Under Debt Instrument [Member]
Debt
Amount paid per installment		$ 5,000
KeyBank National Association
Debt
Outstanding on Revolving Credit Facility				17,000	17,000
KeyBank National Association \| Revolving Credit Facility
Debt
Line of Credit Facility, Maximum Borrowing Capacity											$ 40,000	$ 30,000
Amount of remaining availability				22,600	$ 22,600
KeyBank National Association \| Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt
Debt Instrument, Basis Spread on Variable Rate					2.00%
KeyBank National Association \| Revolving Credit Facility \| Base Rate
Debt
Debt Instrument, Basis Spread on Variable Rate					1.50%
KeyBank National Association \| Revolving Credit Facility \| Fed Funds Effective Rate Overnight Index Swap Rate
Debt
Debt Instrument, Basis Spread on Variable Rate					0.50%
KeyBank National Association \| Letter of Credit
Debt
Line of Credit Facility, Maximum Borrowing Capacity												3,000
Outstanding on Revolving Credit Facility				400	$ 400
KeyBank National Association \| Term Loan
Debt
Aggregate principal amount												$ 10,000
Amount paid per installment					$ 278
Frequency of periodic payment					monthly
Long-term Debt, Total				800	$ 800
KeyBank National Association \| Term Loan \| London Interbank Offered Rate (LIBOR)
Debt
Debt Instrument, Basis Spread on Variable Rate					5.15%
KeyBank National Association \| Equipment Loan
Debt
Aggregate principal amount															$ 4,700
Amount paid per installment					$ 147
Number of installments \| installment					36
Frequency of periodic payment					monthly
Long-term Debt, Total				$ 1,000	$ 1,000
Annual percent of premium prepayment					3.00%
Annual premium decline in premium prepayment					1.00%
Interest rate				7.45%	7.45%
J. H. Fletcher & Co \| Equipment Loan
Debt
Aggregate principal amount				$ 4,400	$ 4,400					$ 3,900				$ 900
Amount paid per installment					$ 200
Number of installments \| installment					24
Frequency of periodic payment					monthly
Long-term Debt, Total				$ 6,400	$ 6,400
Interest rate				0.00%	0.00%
Amount of monthly installments				$ 195	$ 195
Number Of Monthly Installments				24 months
Komatsu Financial Limited Partnership \| Equipment Loan
Debt
Aggregate principal amount													$ 1,000
Amount paid per installment					$ 28
Number of installments \| installment					36
Frequency of periodic payment					monthly
Long-term Debt, Total				$ 600	$ 600
Interest rate				4.60%	4.60%
Komatsu Financial Limited Partnership \| Equipment Loan \| Initial Period For Periodic Payments Under Debt Instrument [Member]
Debt
Amount paid per installment					$ 36
Brandeis Machinery & Supply Company \| Equipment Loan
Debt
Aggregate principal amount								$ 1,400
Amount paid per installment					$ 24
Number of installments \| installment					48
Frequency of periodic payment					monthly
Long-term Debt, Total				$ 800	$ 800
Interest rate				4.80%	4.80%
Investec Bank PLC \| Maben Coal, LLC
Debt
Aggregate principal amount	$ 21,000
Current portion of long-term debt				$ 7,200	$ 7,200
Long-term Debt, Total				$ 13,800	$ 13,800
Amount of monthly installments until maturity	$ 800
Investec Bank PLC \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Maben Coal, LLC
Debt
Debt Instrument, Basis Spread on Variable Rate	3.00%