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Estimated Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block]
10.
Estimated Fair Value of Financial Instruments
 
At June 30, 2016 and December 31, 2015, the carrying amounts of the Company’s financial instruments, which include cash, accounts receivable and accounts payable and accrued expenses, approximate their fair value due to their generally short maturities.