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Note 2 - Stock Incentive Plan Activities (Details) - Incentive Plan [Member]
shares in Thousands
 3 Months Ended
Mar. 31, 2016
$ / shares
shares
Restricted Stock Units (RSUs) [Member]  
Restricted stock unit awards granted (in shares) (13)
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
Stock option awards exercised (in shares) (79)
Stock option awards exercised (in dollars per share) | $ / shares $ 2.32
Stock option awards cancelled (in shares) 109
Stock option awards cancelled (in shares) (109)
Stock option awards cancelled (in dollars per share) | $ / shares $ 9.58
Awards Available (in shares) 127
Options Outstanding (in shares) 10,483
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 7.51