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Note 7 - Fair Value of Financial Instruments (Details) - SBA Servicing Assets Sensitivity Analysis - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
SBA Servicing Asset            
Fair Value of SBA Servicing Asset $ 4,319 $ 4,099 $ 4,267 $ 4,067 $ 3,805 $ 3,477
Composition of SBA Loans Serviced for Others            
Composition of SBA loans serviced for others 100.00% 100.00%        
Weighted Average Remaining Term (in years) 21 years 36 days 21 years 73 days        
Prepayment Speed 7.86% 7.45%        
Effect on fair value of a 10% increase $ (132) $ (116)        
Effect on fair value of a 20% increase $ (257) $ (226)        
Weighted Average Discount Rate 11.59% 12.48%        
Effect on fair value of a 10% increase $ (211) $ (195)        
Effect on fair value of a 20% increase $ (408) $ (378)        
Fixed Rate SBA Loans [Member]            
Composition of SBA Loans Serviced for Others            
Composition of SBA loans serviced for others 0.00% 0.00%        
Adjustable Rate SBA Loans [Member]            
Composition of SBA Loans Serviced for Others            
Composition of SBA loans serviced for others 100.00% 100.00%