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Note 4 - Loans and Allowance for Loan Losses (Details) - Impaired Loans - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Loans with a specific valuation allowance          
Valuation allowance $ 709   $ 709   $ 785
Total          
Loans recorded balance 6,817   6,817   5,381
Loans unpaid principal 8,375   8,375   6,939
Valuation allowance 709   709   785
Loans average investment in impaired loans 4,884 $ 10,069 5,044 $ 11,239  
Loans interest income recognized 1 98 2 99  
Residential Portfolio Segment [Member] | One-to-four Family Units [Member]          
Loans without a specific valuation allowance          
Loans without a specific valuation allowance, recorded balance 746   746   632
Loans without a specific valuation allowance, unpaid principal 746   746   632
Loans without a specific valuation allowance, average investment in impaired loans 749 823 729 752  
Loans without a specific valuation allowance, interest income recognized 1   2 1  
Loans with a specific valuation allowance          
Loans with a specific valuation allowance, recorded balance         279
Loans with a specific valuation allowance, unpaid principal         279
Valuation allowance         36
Loans with a specific valuation allowance, average investment in impaired loans 361 325 456 329  
Total          
Loans recorded balance 746   746   911
Loans unpaid principal 746   746   911
Valuation allowance         36
Loans average investment in impaired loans 1,110 1,148 1,185 1,081  
Loans interest income recognized 1   2 1  
Residential Portfolio Segment [Member] | Construction Loans [Member]          
Loans without a specific valuation allowance          
Loans without a specific valuation allowance, recorded balance 74   74   74
Loans without a specific valuation allowance, unpaid principal 74   74   74
Loans without a specific valuation allowance, average investment in impaired loans 74 94 74 95  
Loans with a specific valuation allowance          
Loans with a specific valuation allowance, recorded balance 2,610   2,610   2,819
Loans with a specific valuation allowance, unpaid principal 3,865   3,865   4,074
Valuation allowance 375   375   376
Loans with a specific valuation allowance, average investment in impaired loans 2,610 3,532 2,680 3,883  
Total          
Loans recorded balance 2,684   2,684   2,893
Loans unpaid principal 3,939   3,939   4,148
Valuation allowance 375   375   376
Loans average investment in impaired loans 2,684 3,626 2,754 3,978  
Commercial Real Estate Portfolio Segment [Member]          
Loans without a specific valuation allowance          
Loans without a specific valuation allowance, average investment in impaired loans   264   408  
Loans with a specific valuation allowance          
Loans with a specific valuation allowance, recorded balance         460
Loans with a specific valuation allowance, unpaid principal         460
Valuation allowance         158
Loans with a specific valuation allowance, average investment in impaired loans   574   412  
Total          
Loans recorded balance         460
Loans unpaid principal         460
Valuation allowance         158
Loans average investment in impaired loans   838   820  
Commercial Portfolio Segment [Member]          
Loans without a specific valuation allowance          
Loans without a specific valuation allowance, recorded balance 326   326   341
Loans without a specific valuation allowance, unpaid principal 326   326   341
Loans without a specific valuation allowance, average investment in impaired loans 327 3,486 332 3,088  
Loans without a specific valuation allowance, interest income recognized   98   98  
Loans with a specific valuation allowance          
Loans with a specific valuation allowance, recorded balance 613   613   685
Loans with a specific valuation allowance, unpaid principal 916   916   988
Valuation allowance 313   313   203
Loans with a specific valuation allowance, average investment in impaired loans 620 699 621 1,897  
Total          
Loans recorded balance 939   939   1,026
Loans unpaid principal 1,242   1,242   1,329
Valuation allowance 313   313   203
Loans average investment in impaired loans 947 4,185 953 4,985  
Loans interest income recognized   98   98  
Consumer Portfolio Segment [Member] | Other Loans [Member]          
Loans without a specific valuation allowance          
Loans without a specific valuation allowance, recorded balance 2,265   2,265    
Loans without a specific valuation allowance, unpaid principal 2,265   2,265    
Loans without a specific valuation allowance, average investment in impaired loans 16   13    
Loans with a specific valuation allowance          
Loans with a specific valuation allowance, recorded balance 183   183   91
Loans with a specific valuation allowance, unpaid principal 183   183   91
Valuation allowance 21   21   12
Loans with a specific valuation allowance, average investment in impaired loans 127 272 139 375  
Total          
Loans recorded balance 2,448   2,448   91
Loans unpaid principal 2,448   2,448   91
Valuation allowance 21   21   $ 12
Loans average investment in impaired loans $ 143 $ 272 $ 152 $ 375