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Note 13 - Asset Retirement Obligations and Environmental Reserves (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Asset Retirement Obligation $ 1,431 $ 1,396  
Asset Retirement Obligation, Accretion Expense 35 32 $ 32
Asset Retirement Obligation, Revision of Estimate $ 0 $ 0 $ 0