Note 14 - Employee Benefit Plan

12 Months Ended

Dec. 31, 2014

Disclosure Text Block Supplement [Abstract]

Compensation and Employee Benefit Plans [Text Block]

14. Employee Benefit Plan

U.S. employees are eligible to participate in the Company’s 401(k) savings plan. Employees may elect to contribute a percentage of their compensation to the plan, and the Company will make matching contributions up to a limit of 5% of an employee’s eligible compensation. In addition, the Company may make annual discretionary contributions. For the years ended December 31, 2014, 2013, and 2012, the Company made matching contributions of $350,049, $362,150, and $326,007, respectively.