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Note 3 - Earnings Per Share - Earnings Per Share Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 60,322 $ 71,608
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 79,661 78,483
Effect of dilutive securities– Employee and director stock options and restricted share awards (in shares) 2,720 2,971
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 82,381 81,454
Basic earnings per common share (in dollars per share) $ 0.76 $ 0.91
Diluted earnings per common share and common share equivalents (in dollars per share) $ 0.73 $ 0.88