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Notes Receivable
6 Months Ended
Jun. 30, 2014
Receivables [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
7. Notes Receivable
 
The note was paid in full on May 2, 2014. For the three months ended June 30, 2014 and 2013, interest income related to the note receivable was $0 and $13,000, respectively. For the six months ended June 30, 2014 and 2013, interest income related to the note receivable was $4,000 and $26,000, respectively.