Note 17 - Subsequent Events

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Subsequent Events [Text Block]

17. Subsequent Events

Annual Grants to Employees

On

February 14, 2019,

the Compensation Committee of the Board of Directors approved approximately

$21.3

million in stock option and restricted stock unit awards to employees. The awards generally will vest over

three

years and will be issued

three

business days subsequent to the filing of this

2018

Form

10

-K.

In connection with the preparation of our consolidated financial statements, an evaluation of subsequent events was performed through the date of filing and there were

no

other events that have occurred that would require adjustments to the financial statements or disclosure.