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Employee Benefit Plan
12 Months Ended
Dec. 31, 2016
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]  
Compensation and Employee Benefit Plans, Other than Share-based Compensation [Text Block]

11.  Employee Benefit Plan

The Company has a defined contribution plan under the Internal Revenue Code Section 401(k). This plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis.  For the year ended December 31, 2016, the Company made a discretionary match of 50% up to the first 3% of employee contributions. All matching contributions have been paid by the Company. The Company’s matching contributions vest in full at the employee’s third anniversary of employment and all employer contributions thereafter vest immediately. The total Company matching contributions were $79,000 for the year ended December 31, 2016.  There were no Company matching contributions for the years ended December 31, 2015 and 2014.