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Note 4 - Mortgage Banking Derivative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Note 4 - Mortgage Banking Derivative (Details) [Line Items]          
Derivative, Notional Amount $ 48,600,000 $ 25,300,000 $ 48,600,000 $ 25,300,000  
Derivative Liability 15,000   15,000   $ 250,000
Other Assets [Member]          
Note 4 - Mortgage Banking Derivative (Details) [Line Items]          
Derivative Asset 165 223,000 165 223,000  
Other Liabilities [Member]          
Note 4 - Mortgage Banking Derivative (Details) [Line Items]          
Derivative Liability 15,000 159,000 15,000 159,000  
Other Noninterest Income [Member]          
Note 4 - Mortgage Banking Derivative (Details) [Line Items]          
Loss on Derivative Instruments, Pretax 101,000 159,000 71,000 159,000  
Gain on Derivative Instruments, Pretax $ 147,000 $ 241,000 $ 318,000 $ 241,000