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Note 8 - Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Assets:    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities $ 349 $ 353
Allowance for doubtful accounts 154 77
Derivative Contracts 0 223
Partnership basis difference 106 90
State Net operating loss carry-forwards 278 283
Total deferred tax assets 887 1,026
Deferred Tax Liabilities:    
Depletion and depreciation 48,123 40,994
Total deferred tax liabilities 48,123 40,994
Net deferred tax liabilities $ 47,236 $ 39,968