Quarterly report pursuant to Section 13 or 15(d)

INCOME TAXES

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INCOME TAXES
3 Months Ended
Mar. 31, 2016
INCOME TAXES [Abstract]  
INCOME TAXES
13. INCOME TAXES

We file an income tax return in the U.S. federal jurisdiction and a margin tax return in Texas. Tax returns for the years 2011 through 2014 remain open for examination in various tax jurisdictions in which we operate.  As of March 31, 2016, and December 31, 2015, we recognized no material adjustments in connection with uncertain tax positions.  The effective tax rate varies from the federal statutory rate of 35% primarily as a result of state tax expense and stock option based compensation offset by the manufacturing deduction.