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Note 7 - Share-Based Compensation - Number of Stock Option Awards Exercisable and their Weighted Average Exercise Price (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Lower Exercise Price Range (in dollars per share) $ 0
Upper Exercise Price Range (in dollars per share) $ 18
Outstanding Number (in shares) | shares 12,095
Outstanding Weighted Average Remaining Life (Year) 6 years 219 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 6.55
Exercisable Number (in shares) | shares 6,499
Exercisable Weighted Average Exercise Price (in dollars per share) $ 5.66
Exercise Price Range 01 [Member]  
Lower Exercise Price Range (in dollars per share) 0
Upper Exercise Price Range (in dollars per share) $ 3
Outstanding Number (in shares) | shares 1,919
Outstanding Weighted Average Remaining Life (Year) 5 years 255 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 1.64
Exercisable Number (in shares) | shares 1,510
Exercisable Weighted Average Exercise Price (in dollars per share) $ 1.53
Exercise Price Range 02 [Member]  
Lower Exercise Price Range (in dollars per share) 3
Upper Exercise Price Range (in dollars per share) $ 6
Outstanding Number (in shares) | shares 4,749
Outstanding Weighted Average Remaining Life (Year) 6 years 328 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 4.02
Exercisable Number (in shares) | shares 2,578
Exercisable Weighted Average Exercise Price (in dollars per share) $ 4.48
Exercise Price Range 03 [Member]  
Lower Exercise Price Range (in dollars per share) 6
Upper Exercise Price Range (in dollars per share) $ 9
Outstanding Number (in shares) | shares 1,153
Outstanding Weighted Average Remaining Life (Year) 3 years 182 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 7.10
Exercisable Number (in shares) | shares 1,118
Exercisable Weighted Average Exercise Price (in dollars per share) $ 7.11
Exercise Price Range 04 [Member]  
Lower Exercise Price Range (in dollars per share) 9
Upper Exercise Price Range (in dollars per share) $ 12
Outstanding Number (in shares) | shares 3,457
Outstanding Weighted Average Remaining Life (Year) 7 years 73 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 11.10
Exercisable Number (in shares) | shares 1,074
Exercisable Weighted Average Exercise Price (in dollars per share) $ 11.29
Exercise Price Range 05 [Member]  
Lower Exercise Price Range (in dollars per share) 12
Upper Exercise Price Range (in dollars per share) $ 15
Outstanding Number (in shares) | shares 722
Outstanding Weighted Average Remaining Life (Year) 8 years
Outstanding Weighted Average Exercise Price (in dollars per share) $ 12.39
Exercisable Number (in shares) | shares 195
Exercisable Weighted Average Exercise Price (in dollars per share) $ 12.73
Exercise Price Range 06 [Member]  
Lower Exercise Price Range (in dollars per share) 15
Upper Exercise Price Range (in dollars per share) $ 18
Outstanding Number (in shares) | shares 95
Outstanding Weighted Average Remaining Life (Year) 8 years 182 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 15.39
Exercisable Number (in shares) | shares 24
Exercisable Weighted Average Exercise Price (in dollars per share) $ 15.39