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Consolidated Statement of Financial Condition (Parentheticals) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Common stock, par value (in dollars per share) $ 0.4167 $ 0.4167
Common stock, shares authorized (in shares) 35,000,000 35,000,000
Common stock, shares issued (in shares) 4,363,346 4,363,346
Common stock, shares outstanding (in shares) 4,095,957 4,086,625
Treasury stock, at cost (in shares) 267,389 276,721