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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, 2017
$ / 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 14,452
Outstanding Weighted Average Remaining Life (Year) 6 years 292 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 6.06
Exercisable Number (in shares) | shares 7,250
Exercisable Weighted Average Exercise Price (in dollars per share) $ 5.69
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 1,724
Outstanding Weighted Average Remaining Life (Year) 4 years 255 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 1.64
Exercisable Number (in shares) | shares 1,598
Exercisable Weighted Average Exercise Price (in dollars per share) $ 1.55
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 8,303
Outstanding Weighted Average Remaining Life (Year) 7 years 182 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 4.63
Exercisable Number (in shares) | shares 3,066
Exercisable Weighted Average Exercise Price (in dollars per share) $ 4.31
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 854
Outstanding Weighted Average Remaining Life (Year) 3 years
Outstanding Weighted Average Exercise Price (in dollars per share) $ 6.90
Exercisable Number (in shares) | shares 848
Exercisable Weighted Average Exercise Price (in dollars per share) $ 6.89
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 2,857
Outstanding Weighted Average Remaining Life (Year) 7 years 36 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 11
Exercisable Number (in shares) | shares 1,383
Exercisable Weighted Average Exercise Price (in dollars per share) $ 10.98
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 619
Outstanding Weighted Average Remaining Life (Year) 6 years 328 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 12.29
Exercisable Number (in shares) | shares 308
Exercisable Weighted Average Exercise Price (in dollars per share) $ 12.39
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) 7 years 182 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 15.39
Exercisable Number (in shares) | shares 47
Exercisable Weighted Average Exercise Price (in dollars per share) $ 15.39