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Note 4 - Loans and Allowance for Loan Losses (Details) - Allowance for Loan Losses - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Ending allowance balance attributable to loans:                                
Individually evaluated for impairment                           $ 93 $ 1,351 $ 1,529
Collectively evaluated for impairment                           3,507 3,495 3,393
Allowance for credit losses $ 3,600 $ 4,846 $ 5,066 $ 5,011 $ 5,011 $ 4,922     $ 4,736 $ 3,600 $ 5,066 $ 4,846 $ 4,922 3,600 4,846 4,922
Ending balance 3,600 4,846   5,066 5,011 4,922       3,600 5,066 4,846 4,922      
Allowance for loan losses:                                
Beginning balance 3,634   5,066 5,011 4,922       4,736 4,846 4,922 4,922 4,736      
Provisions for loan losses 50 0 75 90 25 150 $ 100 $ 225 250 50 115 190 725      
Charge-offs (125)     (93)           (1,382) (226) (620) (892)      
Recoveries 41     58           86 255 354 353      
Receivables Acquired with Deteriorated Credit Quality [Member]                                
Ending allowance balance attributable to loans:                                
Allowance for credit losses 0 0               0   0   0 0  
Ending balance 0 0               0   0        
Allowance for loan losses:                                
Beginning balance                   0            
Home Equity And Second Mortgage [Member]                                
Ending allowance balance attributable to loans:                                
Individually evaluated for impairment                             0 13
Collectively evaluated for impairment                             720 864
Allowance for credit losses   720     877 877     919 720 877 877 877   720 877
Ending balance   720       877           720 877      
Allowance for loan losses:                                
Beginning balance         877       $ 919 720 877 877 919      
Provisions for loan losses                       (195) 4      
Charge-offs                       (154) (90)      
Recoveries                       192 44      
Real Estate Portfolio Segment [Member] | Residential Loan [Member]                                
Ending allowance balance attributable to loans:                                
Individually evaluated for impairment                           75 47  
Collectively evaluated for impairment                           559 562  
Allowance for credit losses 634 609 843 838 838 811       634 843 609 811 634 609 811
Ending balance 634 609   843 838 811       634 843 609 811      
Allowance for loan losses:                                
Beginning balance 672   843 838 811         609 811 811        
Provisions for loan losses (39)     24           42 113          
Charge-offs 0     (21)           (20) (84)          
Recoveries 1     2           3 3          
Real Estate Portfolio Segment [Member] | Residential Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                
Ending allowance balance attributable to loans:                                
Allowance for credit losses 0 0               0   0   0 0  
Ending balance 0 0               0   0        
Allowance for loan losses:                                
Beginning balance                   0            
Real Estate Portfolio Segment [Member] | Land Loan [Member]                                
Ending allowance balance attributable to loans:                                
Individually evaluated for impairment                           0 0  
Collectively evaluated for impairment                           173 201  
Allowance for credit losses 173 201 153 144 144 152       173 153 201 152 173 201 152
Ending balance 173 201   153 144 152       173 153 201 152      
Allowance for loan losses:                                
Beginning balance 197   153 144 152         201 152 152        
Provisions for loan losses (24)     9           (28) 1          
Charge-offs 0     0           0 0          
Recoveries 0     0           0 0          
Real Estate Portfolio Segment [Member] | Land Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                
Ending allowance balance attributable to loans:                                
Allowance for credit losses 0 0               0   0   0 0  
Ending balance 0 0               0   0        
Allowance for loan losses:                                
Beginning balance                   0            
Real Estate Portfolio Segment [Member] | Construction Loans [Member]                                
Ending allowance balance attributable to loans:                                
Individually evaluated for impairment                           0 0  
Collectively evaluated for impairment                           51 60  
Allowance for credit losses 51 60 78 70 70 63       51 78 60 63 51 60 63
Ending balance 51 60   78 70 63       51 78 60 63      
Allowance for loan losses:                                
Beginning balance 65   78 70 63         60 63 63        
Provisions for loan losses (14)     8           (9) 15          
Charge-offs 0     0           0 0          
Recoveries 0     0           0 0          
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                
Ending allowance balance attributable to loans:                                
Allowance for credit losses 0 0               0   0   0 0  
Ending balance 0 0               0   0        
Allowance for loan losses:                                
Beginning balance                   0            
Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member]                                
Ending allowance balance attributable to loans:                                
Individually evaluated for impairment                           8 11  
Collectively evaluated for impairment                           1,661 1,490  
Allowance for credit losses 1,669 1,501 1,280 1,276 1,276 1,284       1,669 1,280 1,501 1,284 1,669 1,501 1,284
Ending balance 1,669 1,501   1,280 1,276 1,284       1,669 1,280 1,501 1,284      
Allowance for loan losses:                                
Beginning balance 1,462   1,280 1,276 1,284         1,501 1,284 1,284        
Provisions for loan losses 204     4           156 (4)          
Charge-offs 0     0           0 0          
Recoveries 3     0           12 0          
Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                
Ending allowance balance attributable to loans:                                
Allowance for credit losses 0 0               0   0   0 0  
Ending balance 0 0               0   0        
Allowance for loan losses:                                
Beginning balance                   0            
Commercial Portfolio Segment [Member]                                
Ending allowance balance attributable to loans:                                
Individually evaluated for impairment                           0 1,293  
Collectively evaluated for impairment                           161 187  
Allowance for credit losses 161 1,480 1,444 1,450 1,450 1,446       161 1,444 1,480 1,446 161 1,480 1,446
Ending balance 161 1,480   1,444 1,450 1,446       161 1,444 1,480 1,446      
Allowance for loan losses:                                
Beginning balance 239   1,444 1,450 1,446         1,480 1,446 1,446        
Provisions for loan losses (58)     (10)           (117) (7)          
Charge-offs (22)     0           (1,205) 0          
Recoveries 2     4           3 5          
Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                
Ending allowance balance attributable to loans:                                
Allowance for credit losses 0 0               0   0   0 0  
Ending balance 0 0               0   0        
Allowance for loan losses:                                
Beginning balance                   0            
Consumer Portfolio Segment [Member] | Home Equity And Second Mortgage [Member]                                
Ending allowance balance attributable to loans:                                
Individually evaluated for impairment                           10 0  
Collectively evaluated for impairment                           638 720  
Allowance for credit losses 648 720 932 902 902 877       648 932 720 877 648 720 877
Ending balance 648 720   932 902 877       648 932 720 877      
Allowance for loan losses:                                
Beginning balance 716   932 902 877         720 877 877        
Provisions for loan losses (38)     41           (45) (70)          
Charge-offs (31)     (36)           (33) (54)          
Recoveries 1     25           6 179          
Consumer Portfolio Segment [Member] | Home Equity And Second Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                
Ending allowance balance attributable to loans:                                
Allowance for credit losses 0 0               0   0   0 0  
Ending balance 0 0               0   0        
Allowance for loan losses:                                
Beginning balance                   0            
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]                                
Ending allowance balance attributable to loans:                                
Individually evaluated for impairment                           0 0  
Collectively evaluated for impairment                           264 275  
Allowance for credit losses 264 275 336 331 331 289       264 336 275 289 264 275 $ 289
Ending balance 264 275   336 331 $ 289       264 336 275 $ 289      
Allowance for loan losses:                                
Beginning balance 283   $ 336 331 $ 289         275 289 289        
Provisions for loan losses 19     14           51 67          
Charge-offs (72)     (36)           (124) (88)          
Recoveries 34     $ 27           62 $ 68          
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                
Ending allowance balance attributable to loans:                                
Allowance for credit losses 0 0               0   0   $ 0 $ 0  
Ending balance $ 0 $ 0               0   $ 0        
Allowance for loan losses:                                
Beginning balance                   $ 0