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2004 Plan Options Available for Grant (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
2004 Plan Options Available for Grant    
Balance at January 1 121,750 144,378
Increase in shares authorized 224,818 200,000
Granted (344,450) (316,600)
Canceled (93,863) (93,972)
Balance at December 31 95,981 121,750