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Note 13 - Employee Benefit Plan
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Compensation and Employee Benefit Plans [Text Block]
13.
Employee Benefit Plan
 
The Company’s 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,
$0.6
million, and
$0.4
million for the years ended
December 
31,
2017,
2016,
and
2015,
respectively.