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Note 7 - Stock-based Compensation - Stock Incentive Plan Activities (Details) - Incentive Plan [Member] - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Awards available, beginning balance (in shares) 2,273 16 2,362
Options outstanding, beginning balance (in shares) 12,095 10,671 9,605
Weighted average exercise price, beginning balance (in dollars per share)     $ 6.21
Awards available, Restricted stock awards granted (in shares) (22) (34) (163)
Awards available, Restricted stock awards cancelled (in shares) 12 22 1
Awards available, stock option awards granted (in shares) (3,915) (2,248) (2,217)
Options outstanding, stock option awards granted (in shares) 3,915 2,248 2,217
Weighted average exercise price, stock option awards granted (in dollars per share) $ 5.33 $ 3.20 $ 11.52
Options outstanding, stock option awards exercised (in shares) (438) (107) (1,118)
Weighted average exercise price, stock option awards exercised (in dollars per share) $ 3.50 $ 2.63 $ 4.36
Awards available, stock option awards cancelled (in shares) 1,120 717 33
Options outstanding, stock option awards cancelled (in shares) (1,120) (717) (33)
Weighted average exercise price, stock option awards cancelled (in dollars per share) $ 9.72 $ 10.78 $ 9.87
Awards available, plan amendment (in shares) 1,000 3,800  
Awards available, ending balance (in shares) 468 2,273 16
Options outstanding, ending balance (in shares) 14,452 12,095 10,671
Weighted average exercise price, ending balance (in dollars per share) $ 6.06 $ 6.55 $ 7.50