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Note 4 - Debt - Summary of Outstanding Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Total debt | $ 86,378 | $ 90,179
Current portion long term debt | 28,227 | 56,534
Long-term debt, net | 58,151 | 33,645
Revolving Credit Facility |  |
Total debt | 41,500 | 42,500
Current portion long term debt | 17,000 |
Equipment loans |  |
Total debt | 2,466 | 2,983
Current portion long term debt | 2,200 |
Senior Notes, net |  |
Total debt | 33,412 | 33,296
Maben Coal LLC |  |
Total debt | 9,000 | $ 11,400
Current portion long term debt | $ 9,000 |

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References No definition available. + Details
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X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, classified as noncurrent. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References No definition available. + Details
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X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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