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Note 4 - Earnings Per Share Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 2,395 $ 16,781
Basic (in shares) 40,553 40,066
Effect of dilutive securities–Employee and director stock options and restricted share awards (in shares) 496 919
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 41,049 40,985
Basic earnings per common share (in dollars per share) $ 0.06 $ 0.42
Diluted earnings per common share and common share equivalents (in dollars per share) $ 0.06 $ 0.41