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2004 Plan Options Available for Grant (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]            
Balance at January 1 62,438 90,571 170,243 90,571 170,243 73,750
Increase in shares authorized 194,442 193,283 152,079 409,900 152,079 151,550
Transferred from 1995 Plan           301,345
Options granted       (409,900) (305,450) (858,950)
Options terminated, cancelled or expired       (188,484) 73,699 502,548
Options outstanding at December 31       62,438 90,571 170,243