Marketable Securities

6 Months Ended

Apr. 30, 2017

Marketable Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

Marketable Securities

On March 11, 2014, the Company entered into a manufacturing agreement with Velocys, plc. As part of the agreement, the Company invested $2,000, which is comprised of Velocys stock with a market value of $1,527 on the date of acquisition and a premium paid of $473, which was being amortized. The agreement was terminated on March 30, 2017. The Company re-measures available-for-sale securities at fair value and records the unrealized gain or loss in other comprehensive income (loss) until realized. A cumulative mark-to-market unfavorable adjustment of $83, net of tax, and a cumulative mark-to-market favorable adjustment of $31, net of tax, was recorded as income (loss) to other comprehensive income for the three and six months ended April 30, 2017, respectively. A cumulative mark-to-market favorable adjustment of $21 and a cumulative mark-to-market unfavorable adjustment of $120, net of tax, was recorded as income (loss) to other comprehensive income for the three and six months ended April 30, 2016, respectively.