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Note 12 - Stock-based Compensation (Details) - Summary of Options Outstanding - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mercantile Plans [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit $ 22.15 $ 6.21 $ 6.21
Exercise price range, upper range limit $ 27.66 $ 35.88 $ 40.28
Number of Options Outstanding (in Shares) 10,688    
Weighted Average Remaining Contractual Life (Years) 6 years 109 days 2 years 1 year 146 days
Weighted Average exercise Price $ 24.32    
Number of Options Exercisable (in Shares) 0    
Options Exercisable, Weighted Average Exercise Price $ 0    
Firstbank Plans [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit 5.19 $ 5.19  
Exercise price range, upper range limit $ 22.00 $ 24.46  
Number of Options Outstanding (in Shares) 123,887    
Weighted Average Remaining Contractual Life (Years) 2 years 255 days 3 years 36 days  
Weighted Average exercise Price $ 12.64    
Number of Options Exercisable (in Shares) 123,887    
Options Exercisable, Weighted Average Exercise Price $ 12.64    
Exercise Price Range 1 [Member] | Mercantile Plans [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit 20.01    
Exercise price range, upper range limit $ 24.00    
Number of Options Outstanding (in Shares) 6,488    
Weighted Average Remaining Contractual Life (Years) 5 years 328 days    
Weighted Average exercise Price $ 22.15    
Number of Options Exercisable (in Shares) 0    
Options Exercisable, Weighted Average Exercise Price $ 0    
Exercise Price Range 2 [Member] | Mercantile Plans [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit 24.01    
Exercise price range, upper range limit $ 28.00    
Number of Options Outstanding (in Shares) 4,200    
Weighted Average Remaining Contractual Life (Years) 6 years 328 days    
Weighted Average exercise Price $ 27.66    
Number of Options Exercisable (in Shares) 0    
Options Exercisable, Weighted Average Exercise Price $ 0    
Exercise Price Range 3 [Member] | Firstbank Plans [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit 4.00    
Exercise price range, upper range limit $ 8.00    
Number of Options Outstanding (in Shares) 48,430    
Weighted Average Remaining Contractual Life (Years) 3 years 292 days    
Weighted Average exercise Price $ 6.58    
Number of Options Exercisable (in Shares) 48,430    
Options Exercisable, Weighted Average Exercise Price $ 6.58    
Exercise Price Range 4 [Member] | Firstbank Plans [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit 8.01    
Exercise price range, upper range limit $ 12.00    
Number of Options Outstanding (in Shares) 18,550    
Weighted Average Remaining Contractual Life (Years) 3 years 328 days    
Weighted Average exercise Price $ 8.60    
Number of Options Exercisable (in Shares) 18,550    
Options Exercisable, Weighted Average Exercise Price $ 8.60    
Exercise Price Range 5 [Member] | Firstbank Plans [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit 12.01    
Exercise price range, upper range limit $ 16.00    
Number of Options Outstanding (in Shares) 27,350    
Weighted Average Remaining Contractual Life (Years) 1 year 328 days    
Weighted Average exercise Price $ 16.00    
Number of Options Exercisable (in Shares) 27,350    
Options Exercisable, Weighted Average Exercise Price $ 16.00    
Exercise Price Range 6 [Member] | Firstbank Plans [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit 20.01    
Exercise price range, upper range limit $ 24.00    
Number of Options Outstanding (in Shares) 29,557    
Weighted Average Remaining Contractual Life (Years) 328 days    
Weighted Average exercise Price $ 22.00    
Number of Options Exercisable (in Shares) 29,557    
Options Exercisable, Weighted Average Exercise Price $ 22.00