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Note 7 - Debt (Details) $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 23, 2022 USD ($) | Apr. 29, 2022 USD ($) installment | Jan. 11, 2022 USD ($) installment | Oct. 29, 2021 USD ($) | Aug. 16, 2021 USD ($) | Jul. 13, 2021 USD ($) | Apr. 20, 2020 USD ($) | Apr. 16, 2020 USD ($) | Jan. 31, 2023 USD ($) | Apr. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) installment | Dec. 31, 2022 USD ($) installment | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 31, 2022 USD ($) | Nov. 24, 2021 USD ($) | Jul. 23, 2021 USD ($)
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamoritzed discounts and issuance costs |  |  |  |  |  |  |  |  |  |  | $ 1,700 |  | $ 1,700 |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  | monthly |  |  |  |  |  |
Debt issuance costs incurred |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,356 |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  | 35,639 |  | 35,639 | 7,674 |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  | 128,896 |  | 128,896 |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  |  | 2,637 | 7,429 | $ 11,926 |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  | $ 127,226 |  | 127,226 | 43,376 |  |  |  |
Insurance financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  | $ 4,600 |  |  |  |  |  |  |
Premium payments |  |  |  |  |  |  |  |  |  |  | 5,600 |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  |  |  | 5,100 |  | 5,100 |  |  |  |  |
Maben Coal, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 21,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maben Coal, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting interest acquired | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,500 |  |  |  |
Amount of remaining availability |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,500 |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  | 20,000 |  | 20,000 |  |  |  |  |
Outstanding on Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |
Senior Notes. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 34,500 |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  | $ 32,800 |  | $ 32,800 |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  |  |  | 10.45% |  | 10.45% |  |  |  |  |
Interest rate |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Amount of note offering costs |  |  |  |  |  | $ 2,400 |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discounts and issuance costs |  |  |  |  |  | $ 1,700 |  |  |  |  |  |  |  |  |  |  |  |
Equipment Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  | $ 6,000 |  | $ 6,000 |  |  |  |  |
PPP Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 0 |  |  |  |
Proceeds from loan |  |  |  |  |  |  | $ 8,400 |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  | $ 8,400 |  |  |  |  |  |  |  |  |  |  |
Ramaco Coal Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 55,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | installment |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Frequency of periodic payment |  | quarterly |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  | 40,000 |  | 40,000 |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  | 40,000 |  | 40,000 |  |  |  |  |
Interest rate |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  | 40,000 |  | 40,000 |  |  |  |  |
Ramaco Coal Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage available for conversion |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available for conversion |  | $ 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ramaco Coal Loan | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid per installment |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ramaco Coal Loan | 2023. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid per installment |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |
Maben Coal Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  | 9,600 |  | $ 9,600 |  |  |  |  |
Maben Coal Loan | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  | monthly |  |  |  |  |  |  |  |  |
Maben Coal Loan | Secured overnight financing rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
KeyBank National Association | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 40,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
KeyBank National Association | Revolving Credit Facility | Secured overnight financing 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
KeyBank National Association | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  | monthly |  |  |  |  |
Amount of monthly installments |  |  |  |  |  |  |  |  |  |  | 278 |  | $ 278 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 600 |  | $ 600 |  |  |  |  |
Annual percent of premium prepayment |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |
Annual premium decline in premium prepayment |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 7.45% |  |  |  |  |  |  |  |  |  |
J. H. Fletcher & Co | Equipment Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 4,400 |  |  |  |  | $ 3,900 | $ 900
Amount paid per installment |  |  |  |  |  |  |  |  |  |  |  | $ 195 |  |  |  |  |  |
Number of installments | installment |  |  |  |  |  |  |  |  |  |  |  | 24 |  |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  | monthly |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  | 6,100 |  | $ 6,100 |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00%
Amount of monthly installments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200
Number Of Monthly Installments |  |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |
Komatsu Financial Limited Partnership | Equipment Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid per installment |  |  |  |  | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  | monthly |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  | 500 |  | $ 500 |  |  |  |  |
Interest rate |  |  |  |  | 4.60% |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Monthly Installments |  |  |  |  |  |  |  |  |  |  |  |  | 36 months |  |  |  |  |
Komatsu Financial Limited Partnership | Equipment Loan | Initial Period For Periodic Payments Under Debt Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of monthly installments |  |  |  |  | $ 36 |  |  |  |  |  |  |  |  |  |  |  |  |
Brandeis Machinery & Supply Company | Equipment Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 1,400 |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |
Number of installments | installment |  |  | 48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Frequency of periodic payment |  |  | monthly |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  | 1,200 |  | $ 1,200 |  |  |  |  |
Interest rate |  |  | 4.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investec Bank PLC | Maben Coal Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 21,000 |  |  |  |  |  |  |  |  |  | $ 21,000 |  | $ 21,000 |  |  |  |  |
Investec Bank PLC | Maben Coal Loan | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of monthly installments until maturity |  |  |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |

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