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Note 7 - Revenue 1 (Details Textual) - Coal [Member] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020
Accounts Receivable, after Allowance for Credit Loss, Total |  |  | $ 14.4
INDIANA | Revenue from Contract with Customer Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 73.00% | 74.00% |

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