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Note 7 - Goodwill and Intangible Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 7 - Goodwill and Intangible Assets (Details) [Line Items]      
Goodwill $ 4,559,000 $ 4,559,000  
Finite-Lived Core Deposits, Gross 76,000 116,000  
Core Deposits [Member]      
Note 7 - Goodwill and Intangible Assets (Details) [Line Items]      
Finite-Lived Intangible Assets, Accumulated Amortization $ 320,000 280,000  
Finite-Lived Intangible Asset, Useful Life 10 years    
Amortization of Intangible Assets $ 40,000 $ 40,000 $ 40,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two 40,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three $ 36,000