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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Retained Earnings [Member]        
Common dividends declared, per share (in dollars per share) $ 0.25 $ 0.21 $ 0.71 $ 1.05
Treasury Stock [Member]        
Common stock options exercised, shares (in shares) 3,407 8,629 7,752 18,979
Issuance of stock to 401(k) plan, shares (in shares)   2,891   10,543
Purchase of treasury shares, shares (in shares)       670,016
Purchase of treasury shares, per share (in dollars per share)       $ 31.77
Issuance of stock to 401(k) plan, shares (in shares) 3,010   9,663  
Purchase of treasury shares, shares (in shares)   195,776    
Purchase of treasury shares, per share (in dollars per share)   $ 33.57    
Repurchase of common shares, shares (in shares) 60,500   487,400  
Repurchase of common shares, per share (in dollars per share) $ 33.11   $ 33.57