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Note 4 - Common Shares | 12 Months Ended
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Dec. 31, 2012
Common Shares [Text Block] | 4. COMMON SHARES At December 31, 2012, Fuel Tech had 22,111,675 common shares issued and 22,102,549 outstanding, with an additional 6,715 shares reserved for issuance upon conversion of the nil coupon non-redeemable convertible unsecured loan notes (see Note 6) and 2,666,024 shares reserved for issuance upon the exercise or vesting of equity awards, of which 1,833,500 are stock options that are currently exercisable (see Note 7). At December 31, 2011, Fuel Tech had 23,644,301 common shares issued and outstanding, with an additional 6,715 shares reserved for issuance upon conversion of the nil coupon non-redeemable convertible unsecured loan notes and 2,309,165 shares reserved for issuance upon the exercise or vesting of equity awards, of which 1,718,062 are stock options that are currently exercisable.

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