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Fair Value of Financial Instruments (Details Textual) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Cash and cash equivalents $ 11,155 $ 14,625 $ 8,520 $ 9,954
Money Market Accounts [Member]
       
Cash and cash equivalents $ 9,000 $ 11,000