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Note 2 - Stock-based Compensation - Stock Incentive Plan Activities (Details) - Incentive Plan [Member]
shares in Thousands
 9 Months Ended
Sep. 30, 2016
$ / shares
shares
Restricted Stock Units (RSUs) [Member]  
Restricted stock unit awards granted (in shares) (28)
Restricted stock unit awards cancelled (in shares) 15
Awards Available (in shares) 16
Options Outstanding (in shares) 10,671
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 7.50
Plan amendment (in shares) 3,800
Stock option awards granted (in shares) (2,248)
Stock option awards granted (in shares) 2,248
Stock option awards granted (in dollars per share) | $ / shares $ 3.20
Stock option awards exercised (in shares) (88)
Stock option awards exercised (in dollars per share) | $ / shares $ 2.23
Stock option awards cancelled (in shares) 593
Stock option awards cancelled (in shares) (593)
Stock option awards cancelled (in dollars per share) | $ / shares $ 11.13
Awards Available (in shares) 2,148
Options Outstanding (in shares) 12,238
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 6.57