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Note 4 - Stockholders' Equity - Nonvested Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member]
shares in Thousands
6 Months Ended
Jun. 30, 2016
$ / shares
shares
Nonvested, January 1, 2016 (in shares) | shares 1,166
Nonvested, January 1, 2016 (in dollars per share) | $ / shares $ 17.03
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 11.87
Vested (in shares) | shares (258)
Vested (in dollars per share) | $ / shares $ 16.70
Forfeited (in shares) | shares (42)
Forfeited (in dollars per share) | $ / shares $ 17.27
Nonvested, June 30, 2016 (in shares) | shares 916
Nonvested, June 30, 2016 (in dollars per share) | $ / shares $ 16.83