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Note 11 - Federal Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Note 11 - Federal Income Taxes (Details) [Line Items]    
Deferred Tax Assets, Capital Loss Carryforwards $ 270,000 $ 450,000
Unrecognized Tax Benefits 0 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0 0
Firstbank Corporation [Member]    
Note 11 - Federal Income Taxes (Details) [Line Items]    
Deferred Tax Assets, Capital Loss Carryforwards 300,000 $ 500,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (200,000)  
Capital Loss Carryforward [Member]    
Note 11 - Federal Income Taxes (Details) [Line Items]    
Tax Credit Carryforward, Amount $ 800,000