|
Note 5 - Acquisition (Details) - Changes in the Carrying Amount of Goodwill (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Aug. 08, 2014
|
|
| Goodwill [Line Items] | |||
| Balance as of December 31, 2013 | $ 2,117 | ||
| Balance as of December 31, 2014 | 16,659 | 2,117 | |
| Alpine Biosciences, Inc. [Member] | |||
| Goodwill [Line Items] | |||
| Balance as of December 31, 2013 | 14,542 | ||
| Goodwill recorded in connection with the acquisition of Alpine | 14,542 | ||
| Balance as of December 31, 2014 | $ 14,542 |