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v3.24.0.1

Current and Long-Term Financing (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) unitOfEquipment notePayable | Dec. 31, 2022 USD ($) | Dec. 15, 2026 USD ($)
Line of Credit Facility [Line Items] |  |  |
Interest paid | $ 2,400,000 | $ 2,000,000 |
Outstanding notes payable | 35,844,000 | 18,900,000 |
NACoal |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit agreement |  | 0 |
Line of credit facility, remaining borrowing capacity | 105,120,000 | $ 116,285,000 |
Secured Debt |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, average borrowing | 6,200,000 |  |
Secured Debt | NACoal |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | 150,000,000 |  |
Revolving credit agreement | 10,000,000 |  |
Line of credit facility, remaining borrowing capacity | 105,100,000 |  |
Amount of letters of credit outstanding | $ 34,900,000 |  |
Line of credit facility, unused capacity, commitment fee percentage | 0.34% |  |
Weighted average interest rate | 6.06% | 2.54% |
Fixed charge coverage ratio | 1.10 |  |
Line of credit facility, availability required to pay dividends | $ 15,000,000 |  |
Secured Debt | NACoal | Demand Note Payable to Unconsolidated Subsidiary |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding notes payable | $ 7,000,000 | $ 5,700,000 |
Interest rate | 5.12% | 3.36% |
Secured Debt | NACoal | Notes Payable, Maturing At Various Dates Through 2029 |  |  |
Line of Credit Facility [Line Items] |  |  |
Weighted average interest rate | 5.42% |  |
Outstanding notes payable | $ 18,800,000 | $ 13,200,000 |
Number of notes payable | notePayable | 11 |  |
Number of specified units of equipment | unitOfEquipment | 16 |  |
Secured Debt | NACoal | Notes Payable, Maturing December 2026 | Forecast |  |  |
Line of Credit Facility [Line Items] |  |  |
Principal payment due at maturity |  |  | $ 4,400,000
Secured Debt | NACoal | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum debt to EBITDA ratio | 2.75 |  |
Maximum EBITDA ratio | 1.50 |  |
Secured Debt | NACoal | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Minimum interest coverage ratio | 4.00 |  |
Maximum EBITDA ratio | 1.50 |  |
Secured Debt | NACoal | Base Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.23% |  |
Secured Debt | NACoal | Secured Overnight Financing Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 2.23% |  |

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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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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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