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Note L - Income Taxes
 3 Months Ended
Mar. 31, 2012
Income Tax Disclosure [Text Block]
Note L:                      Income Taxes

The Company’s effective tax rates of 38.0% and 50.8% for the three-month periods ended March 31, 2012 and 2011 differs from the statutory federal tax rate of 34% due primarily to state taxes, stock-based compensation, differences between U.S. and foreign tax rates, foreign losses incurred with no related tax benefit, changes in state tax rates, tax credits, and non-deductible meals and entertainment expenses.

Fuel Tech had unrecognized tax benefits of $667, including penalties and interest, as of March 31, 2012 and December 31, 2011, all of which, if ultimately recognized, will reduce Fuel Tech’s annual effective tax rate.