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Note 8 - Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Accrued liabilities $ 279 $ 349
Allowance for credit losses 93 154
Partnership basis difference 114 106
State Net operating loss carry-forwards 212 278
Total deferred tax assets 698 887
Depletion and depreciation 54,103 48,123
Total deferred tax liabilities 54,103 48,123
Net deferred tax liabilities $ 53,405 $ 47,236