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10. Stock Based Compensation (Details) (Employee Stock Plan, USD $)
 6 Months Ended
Jun. 30, 2014
Employee Stock Plan
  
Shares Available for Grant, Beginning 74
Shares Available for Grant, Authorized 100
Shares Available for Grant, Number of Shares Granted (148)
Shares Available for Grant, Exercised 0
Shares Available for Grant, Forfeited/Expired 65
Shares Available for Grant, Ending 91
Number of Shares Outstanding, Beginning 913
Number of Shares Authorized   
Number of Shares Granted 148
Number of Shares Exercised (144)
Number of Shares Forfeited/Expired (65)
Number of Shares Outstanding, Ending 852
Weighted Average Exercise Price Outstanding, Beginning $ 4.90
Weighted Average Exercise Price Authorized $ 0
Weighted Average Exercise Price Granted $ 4.20
Weighted Average Exercise Price Exercised $ 1.60
Weighted Average Exercise Price Forfeited/Expired $ 2.69
Weighted Average Exercise Price Outstanding, Ending $ 5.56