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Note 12 - Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income taxes computed at the federal statutory rate $ 6,320 $ 5,289 $ (5,242)
(Income) loss taxed as partnership     (552)
State taxes, net of federal benefits 945 970 (610)
Percentage depletion (2,093) (1,033)  
Changes in tax status     (205)
Change in valuation allowance   (4,464) 4,464
Change in enacted tax rates     2,119
Other, net (9) (649) $ 26
Total $ 5,163 $ 113