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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, 2016
$ / shares
shares
Non-vested stock option awards (in shares) | shares 4,863
Weighted average grant-date fair value (in dollars per share) | $ / shares $ 6.40
Stock option awards granted (in shares) | shares 2,248
Stock option awards granted (in dollars per share) | $ / shares $ 2.17
Stock option awards vested (in shares) | shares (1,278)
Stock option awards vested (in dollars per share) | $ / shares $ 4.99
Stock option awards forfeited (in shares) | shares (235)
Stock option awards forfeited (in dollars per share) | $ / shares $ 6.79
Balance December 31, 2016 (in shares) | shares 5,598
Balance December 31, 2016 (in dollars per share) | $ / shares $ 5.40