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Note 7 - Borrowings (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2003
Note 7 - Borrowings (Details) [Line Items]          
Advances from Federal Home Loan Banks     $ 132,000,000 $ 120,000,000  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged     $ 227,900,000    
Preferred Stock, Shares Issued (in Shares)     0 0  
Derivative, Variable Interest Rate     3.75%    
Number of Consecutive Quarters for Interest Deferment     20    
Interest Expense, Debt   $ 1,600,000      
Interest Payable     $ 430,000    
Number of Years of Duration of Trust     30 years    
Proceeds from Notes Payable $ 2,000,000        
London Interbank Offered Rate (LIBOR) [Member]          
Note 7 - Borrowings (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate     3.15%    
Trust [Member]          
Note 7 - Borrowings (Details) [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent         100.00%
Preferred Stock, Shares Issued (in Shares)         8,000,000
Excess Tier One Risk Based Capital to Risk Weighted Assets         25.00%
Unsecured Debt [Member] | Trust [Member]          
Note 7 - Borrowings (Details) [Line Items]          
Subordinated Debt     $ 8,200,000    
Notes Payable, Other Payables [Member]          
Note 7 - Borrowings (Details) [Line Items]          
Debt Instrument, Term 10 years        
Debt Instrument, Interest Rate, Stated Percentage 1.75%        
Federal Home Loan Bank Borrowings [Member]          
Note 7 - Borrowings (Details) [Line Items]          
Long Term Debt Additional Available Amount     11,900,000    
Line of Credit Facility, Maximum Borrowing Capacity     2,000,000    
Long-term Line of Credit     $ 0 $ 0  
Minimum [Member]          
Note 7 - Borrowings (Details) [Line Items]          
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate     30 days    
Federal Home Loan Bank, Advances, Interest Rate     0.41%    
Maximum [Member]          
Note 7 - Borrowings (Details) [Line Items]          
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate     4 months    
Federal Home Loan Bank, Advances, Interest Rate     0.50%