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v3.19.3.a.u2

Current and Long-Term Financing (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 15, 2026 USD ($)
Line of Credit Facility [Line Items] |  |  |
Interest paid | $ 900,000 | $ 2,000,000 |
Outstanding notes payable | 24,300,000 | 10,600,000 |
NACoal |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | 150,000,000 |  |
Line of credit facility, amount outstanding | 16,000,000 | 4,000,000 |
Line of credit facility, remaining borrowing capacity | 132,644,000 | 144,481,000 |
Amount of letters of credit outstanding | $ 1,400,000 |  |
Line of credit facility, unused capacity, commitment fee percentage | 0.30% |  |
Weighted average interest rate | 5.50% |  |
Minimum interest coverage ratio | 4.00 |  |
Fixed charge coverage ratio | 1.10 |  |
Line of credit facility, availability required to pay dividends | $ 15,000,000 |  |
NACoal | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum EBITDA ratio | 3.00 |  |
NACoal | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum EBITDA ratio | 2.00 |  |
NACoal | Base Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 0.75% |  |
NACoal | LIBOR Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.75% |  |
Secured Debt | Demand Note Payable to Unconsolidated Subsidiary |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate | 1.68% |  |
Outstanding notes payable | $ 2,000,000 |  |
Secured Debt | 5.29% Note Payable Maturing 2026 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate | 5.29% |  |
Debt instrument term | 10 years |  |
Outstanding notes payable | $ 6,300,000 | $ 6,600,000 |
Secured Debt | Forecast | 5.29% Note Payable Maturing 2026 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Principal payment due at maturity |  |  | $ 4,400,000

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