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Note 3 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Capitalized Interest Costs, Including Allowance for Funds Used During Construction, Total $ 3.1 $ 1.4 $ 7.7 $ 2.9
Depreciation, Depletion and Amortization, Total $ 1.4 $ 1.3 $ 4.0 $ 4.1