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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retained Earnings [Member]      
Common dividends declared, per share (in dollars per share) $ 0.96 $ 0.78 $ 0.68
Special common dividends declared, per share (in dollars per share)   $ 0.48  
Treasury Stock [Member]      
Common stock options exercised, shares (in shares) 8,459 24,186 16,185
Issuance of treasury stock to 401(k) plan, shares (in shares) 12,407 11,331 15,254
Purchase of treasury shares, shares (in shares)   1,060,312 50,118
Purchase of treasury shares, per share (in dollars per share)   $ 32.45 $ 25.16
Purchase of treasury shares, shares (in shares)   1,060,312 50,118
Purchase of treasury shares, per share (in dollars per share)   $ 32.45 $ 25.16
Purchase of treasury shares, shares (in shares) 487,400    
Purchase of treasury shares, per share (in dollars per share) $ 33.57    
Common stock options exercised, shares (in shares) 8,459