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Note 4 - Debt - Revolving Credit Facility (Details) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 15, 2023 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Debt |  |  |
Current portion long term debt |  | $ 28,227 | $ 56,534
Senior Notes, net |  |  |
Debt |  |  |
Estimated fair value |  | 35,400 | $ 35,500
Equipment loans |  |  |
Debt |  |  |
Current portion long term debt |  | 2,200 |
Maben Coal LLC |  |  |
Debt |  |  |
Current portion long term debt |  | $ 9,000 |
Revolving loans under the new facility |  |  |
Debt |  |  |
Fixed charge coverage ratio |  | 1.10 |
Average daily cash balance |  | $ 5,000 |
Additional amount to be maintained in a separate dedicated account |  | 1,000 |
Revolving Credit Facility |  |  |
Debt |  |  |
Initial aggregate revolving commitment | $ 125,000 |  |
Initial aggregate revolving commitment |  | 106,800 |
Accordion feature | $ 50,000 |  |
Outstanding borrowings |  | 41,500 |
Line of Credit Facility, Remaining Borrowing Capacity |  | 65,300 |
Current portion long term debt |  | $ 17,000 |
Revolving Credit Facility | Secured overnight financing rate |  |  |
Debt |  |  |
Interest rate, basis spread | 2.00% |  |
Revolving Credit Facility | Base Rate |  |  |
Debt |  |  |
Interest rate, basis spread | 1.50% |  |
Revolving Credit Facility | Base Rate | Minimum |  |  |
Debt |  |  |
Effective interest rate | 0.50% |  |
Revolving Credit Facility | Base Rate | Maximum |  |  |
Debt |  |  |
Effective interest rate | 3.00% |  |

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- 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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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: 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 + Details
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