Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2015

Investments, All Other Investments [Abstract]

Financial Instruments Disclosure [Text Block]

15. Fair Value of Financial Instruments

The carrying amounts of variable rate notes payable to the banks approximate fair value as of June 30, 2015 and December 31, 2014, because these notes reflect market changes to interest rates. The fair value of the subordinated convertible debt approximates its principal amount of $11,000 at June 30, 2015 and December 31, 2014, which exceeds its carrying amount as a result of the unamortized discount related to the bifurcation of the embedded conversion option. The fair value of the advance to supplier approximates its carrying value. Derivative financial instruments are carried at fair value (see Note 13).