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Note 12 - Stock-based Compensation - Summary Of Stock Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mercantile Plans [Member]      
Outstanding at beginning of year (in shares) 11,308 35,335 60,876
Outstanding at beginning of year (in dollars per share) $ 24.50 $ 31.09 $ 33.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 6,500 4,820 6,488
Granted (in dollars per share) $ 36.22 $ 27.66 $ 22.15
Exercised (in shares) (1,000) (2,700) (2,845)
Exercised (in dollars per share) $ 22.15 $ 6.21 $ 17.74
Forfeited or expired (in shares) 0 (26,147) (29,184)
Forfeited or expired (in dollars per share) $ 0 $ 35.88 $ 34.60
Outstanding at end of year (in shares) 16,808 11,308 35,335
Outstanding at end of year (in dollars per share) $ 29.17 $ 24.50 $ 31.09
Options exercisable at year-end (in shares) 5,488 0 28,847
Options exercisable at year-end (in dollars per share) $ 22.15   $ 33.11
First Bank Plans [Member]      
Outstanding at beginning of year (in shares) 123,887 217,982 0
Outstanding at beginning of year (in dollars per share) $ 12.64 $ 14.89 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0 0
Granted (in dollars per share) $ 0 $ 0 $ 0
Exercised (in shares) (71,711) (56,417) (27,740)
Exercised (in dollars per share) $ 13.33 $ 15.50 $ 8.34
Forfeited or expired (in shares) (7,901) (37,678) (36,456)
Forfeited or expired (in dollars per share) $ 22 $ 21.39 $ 24.46
Outstanding at end of year (in shares) 44,275 123,887 217,982
Outstanding at end of year (in dollars per share) $ 9.86 $ 12.64 $ 14.89
Options exercisable at year-end (in shares) 44,275 123,887 210,777
Options exercisable at year-end (in dollars per share) $ 9.86 $ 12.64 $ 15.22
Replaced as part of merger (in shares) 0 0 282,178
Replaced as part of merger (in dollars per share) $ 0 $ 0 $ 15.48