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Note 7 - Share-Based Compensation - Changes in the Number and Weighted-Average Grant-Date Fair Value (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Non-vested stock option awards (in shares) | shares 5,598
Weighted average grant-date fair value (in dollars per share) | $ / shares $ 5.40
Stock option awards granted (in shares) | shares 3,915
Stock option awards granted (in dollars per share) | $ / shares $ 3.63
Stock option awards vested (in shares) | shares (1,916)
Stock option awards vested (in dollars per share) | $ / shares $ 4.86
Stock option awards forfeited (in shares) | shares (395)
Stock option awards forfeited (in dollars per share) | $ / shares $ 5.84
Balance December 31, 2017 (in shares) | shares 7,202
Balance December 31, 2017 (in dollars per share) | $ / shares $ 4.56