Note 2 - Business Combination (Details) - Pro Forma Information - Jun. 30, 2014 - USD ($)	Total	Total
Note 2 - Business Combination (Details) - Pro Forma Information [Line Items]
Net interest income		$ 47,934,000
Noninterest expense		39,716,000
Net income		$ 11,965,000
Net income per diluted share (in Dollars per share)		$ 0.71
Firstbank Corporation [Member]
Note 2 - Business Combination (Details) - Pro Forma Information [Line Items]
Net interest income	$ 24,051,000
Noninterest expense	19,698,000
Net income	$ 5,708,000
Net income per diluted share (in Dollars per share)	$ 0.34