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Note 8 - Income Taxes
9 Months Ended
Sep. 30, 2019
Notes to Financial Statements  
INCOME TAXES

NOTE 8—INCOME TAXES

Income tax provisions for interim quarterly periods are based on an estimated annual effective income tax rate calculated separately from the effect of significant, infrequent or unusual items related specifically to interim periods. The effective tax rate for the three months ended September 30, 2019 was 17%, compared to 1% for the three months ended September 30, 2018. The effective tax rate for the nine months ended September 30, 2019 and 2018 was 17% and 6%, respectively. The primary difference from the statutory rate of 21% is related to permanent differences for state income taxes, non-deductible expenses and the difference in depletion expense between U.S. GAAP and federal income tax purposes. In 2018, we removed the valuation allowance against deferred taxes, which reduced our effective tax rate.