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Note 2 - Stock Incentive Plan Activities (Details)
shares in Thousands
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Awards Available (in shares) 2,362
Options Outstanding (in shares) 9,605
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 6.21
Restricted stock unit awards granted (in shares) (155)
Restricted stock unit awards cancelled (in shares) 1
Stock option awards granted (in shares) (1,319)
Stock option awards granted (in shares) 1,319
Stock option awards granted (in dollars per share) | $ / shares $ 11.99
Stock option awards exercised (in shares) (1,102)
Stock option awards exercised (in dollars per share) | $ / shares $ 4.36
Stock option awards cancelled (in shares) 28
Stock option awards cancelled (in shares) (28)
Stock option awards cancelled (in dollars per share) | $ / shares $ 9.05
Balance September 30, 2015 (in shares) 917
Balance September 30, 2015 (in shares) 9,794
Balance September 30, 2015 (in dollars per share) | $ / shares $ 7.19