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Equity Plan (Tables)
 12 Months Ended
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The number of remaining shares authorized to be issued under the various equity plans are as follows:
 
 
 2003 Equity Plan
 
 2009 Equity Plan
Shares Authorized for Issuance
 
250,000

 
8,995,000

Outstanding Stock Options
 
(122,395
)
 
(4,304,881
)
Exercised Stock Options
 
(9,250
)
 
(80,856
)
Restricted stock or equity grants issued under Equity Plans
 
(88,993
)
 
(946,711
)
Shares Expired
 
(29,362
)
 
—

Total common shares remaining to be issued under the Equity Plans
 
—

 
3,662,552