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Note 7 - Loans and Related Allowance for Loan Losses (Details) - Allowance for Loan Losses - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Ending allowance balance attributable to loans:        
Individually evaluated for impairment     $ 811 $ 833
Collectively evaluated for impairment     5,546 5,552
Total ending allowance balance $ 6,357 $ 6,846 6,357 6,385
Ending allowance balance attributable to loans:        
ALLL balance, period end 6,385 6,846    
ALLL balance, period start 6,357 6,447    
Charge-offs (177) (679)    
Recoveries 44 175    
Provision 105 105    
Commercial and Industrial [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment     323 388
Collectively evaluated for impairment     260 479
Total ending allowance balance 583 642 583 867
Ending allowance balance attributable to loans:        
ALLL balance, period end 867 642    
ALLL balance, period start 583 493    
Charge-offs (120) (100)    
Recoveries 37 162    
Provision (201) (211)    
Real Estate Construction Porfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment     118 130
Collectively evaluated for impairment     129 146
Total ending allowance balance 247 868 247 276
Ending allowance balance attributable to loans:        
ALLL balance, period end 276 868    
ALLL balance, period start 247 494    
Charge-offs   (385)    
Recoveries 0      
Provision (29) 11    
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment     269 276
Collectively evaluated for impairment     2,447 2,863
Total ending allowance balance 2,716 3,703 2,716 3,139
Ending allowance balance attributable to loans:        
ALLL balance, period end 3,139 3,703    
ALLL balance, period start 2,716 3,459    
Charge-offs (42) (191)    
Recoveries 4 12    
Provision (385) (65)    
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment     101 39
Collectively evaluated for impairment     2,682 2,039
Total ending allowance balance 2,783 1,576 2,783 2,078
Ending allowance balance attributable to loans:        
ALLL balance, period end 2,078 1,576    
ALLL balance, period start 2,783 1,958    
Charge-offs   0    
Provision 705 382    
Consumer Portfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment       0
Collectively evaluated for impairment     28 25
Total ending allowance balance 28 57 $ 28 $ 25
Ending allowance balance attributable to loans:        
ALLL balance, period end 25 57    
ALLL balance, period start 28 43    
Charge-offs (15) (3)    
Recoveries 3 1    
Provision $ 15 $ (12)