Note 14 - Employee Benefit Plan

12 Months Ended

Dec. 31, 2016

Notes to Financial Statements

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

140%

matching contributions up to a limit of

5%

of an employee’s eligible compensation. In addition, the Company

may

make annual discretionary contributions. The Company made matching contributions of

$0.6

million ,

$0.4

million, and

$0.4

million for the years ended

December

 

31,

2016,

2015,

and

2014,

respectively.