6. Income taxes	6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	6. Income taxes We are subject to U.S. federal income tax as well as income tax in certain state and foreign jurisdictions. We have substantially concluded all U.S. federal income tax, state and local, and foreign tax regulatory examination matters through 2011. During 2013, an examination of our 2010 federal tax return was completed. However, our federal tax returns for the years 2012 through 2014 remain open to examination. Various state and foreign tax jurisdiction tax years remain open to examination as well, though we believe that any additional assessment would be immaterial to the Condensed Consolidated Financial Statements. No state or foreign tax jurisdiction income tax returns are currently under examination. As of June 30, 2016, we had $114,000 of total gross unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in any future periods.

6. Income taxes

6 Months Ended

Jun. 30, 2016

6. Income taxes

We are subject to U.S. federal income tax as well as income tax in certain state and foreign jurisdictions. We have substantially concluded all U.S. federal income tax, state and local, and foreign tax regulatory examination matters through 2011. During 2013, an examination of our 2010 federal tax return was completed. However, our federal tax returns for the years 2012 through 2014 remain open to examination. Various state and foreign tax jurisdiction tax years remain open to examination as well, though we believe that any additional assessment would be immaterial to the Condensed Consolidated Financial Statements. No state or foreign tax jurisdiction income tax returns are currently under examination. As of June 30, 2016, we had $114,000 of total gross unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in any future periods.