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Note 11 - Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income taxes computed at the federal statutory rate $ 5,289 $ (5,242) $ (2,555)
(Income) loss taxed as partnership (552) 2,555
State taxes, net of federal benefits 970 (610)
Percentage depletion (1,033)
Changes in tax status (205)
Change in valuation allowance (4,464) 4,464
Change in enacted tax rates 2,119
Other, net (649) 26
Total $ 113