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Note 4 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Capitalized Interest Costs, Including Allowance for Funds Used During Construction $ 1,100 $ 1,000 $ 3,200 $ 4,000
Depreciation $ 2,326 $ 2,274 $ 7,033 $ 6,121