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Note 6 - Allowance for Loan Losses and Credit Quality Information (Details) - Impaired Loans and Related Allowances - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Loans with an allowance recorded:    
Related allowance $ 1,009 $ 1,074
Total:    
Recorded investment 5,799 12,956
Unpaid principal balance 8,269 16,436
Related allowance 1,009 1,074
Average recorded investment 10,719 15,518
Interest income recognized 259 347
1-4 Family Porfolio Segment[Member]    
Loans with no related allowance recorded:    
Recorded investment, with no related allowance 1,251 755
Unpaid principal balance, with no related allowance 1,251 755
Related allowance 0 0
Average recorded investment, with no related allowance 943 432
Interest income recognized, with no related allowance 60 32
Loans with an allowance recorded:    
Recorded investment, with related allowance 952 1,112
Unpaid principal balance, with related allowance 952 1,112
Related allowance 223 270
Average recorded investment, with related allowance 1,045 1,543
Interest income recognized, with related allowance 14 14
Total:    
Recorded investment 2,203 1,867
Unpaid principal balance 2,203 1,867
Related allowance 223 270
Average recorded investment 1,988 1,975
Interest income recognized 74 46
Commercial Real Estate Portfolio Segment [Member] | Residential Developments [Member]    
Loans with no related allowance recorded:    
Recorded investment, with no related allowance 25 7,416
Unpaid principal balance, with no related allowance 1,706 10,040
Related allowance 0 0
Average recorded investment, with no related allowance 5,189 7,633
Interest income recognized, with no related allowance 96 219
Loans with an allowance recorded:    
Recorded investment, with related allowance 1,947 1,522
Unpaid principal balance, with related allowance 1,947 1,522
Related allowance 270 240
Average recorded investment, with related allowance 1,621 3,121
Interest income recognized, with related allowance 0 0
Total:    
Recorded investment 1,972 8,938
Unpaid principal balance 3,653 11,562
Related allowance 270 240
Average recorded investment 6,810 10,754
Interest income recognized 96 219
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]    
Loans with no related allowance recorded:    
Recorded investment, with no related allowance 44 48
Unpaid principal balance, with no related allowance 184 216
Related allowance 0 0
Average recorded investment, with no related allowance 319 50
Interest income recognized, with no related allowance 7 6
Loans with an allowance recorded:    
Recorded investment, with related allowance 188 742
Unpaid principal balance, with related allowance 188 743
Related allowance 26 130
Average recorded investment, with related allowance 302 847
Interest income recognized, with related allowance 32 32
Total:    
Recorded investment 232 790
Unpaid principal balance 372 959
Related allowance 26 130
Average recorded investment 621 897
Interest income recognized 39 38
Consumer Portfolio Segment [Member]    
Loans with no related allowance recorded:    
Recorded investment, with no related allowance 475 463
Unpaid principal balance, with no related allowance 476 464
Related allowance 0 0
Average recorded investment, with no related allowance 387 467
Interest income recognized, with no related allowance 10 15
Loans with an allowance recorded:    
Recorded investment, with related allowance 502 343
Unpaid principal balance, with related allowance 519 360
Related allowance 370 307
Average recorded investment, with related allowance 448 451
Interest income recognized, with related allowance 20 9
Total:    
Recorded investment 977 806
Unpaid principal balance 995 824
Related allowance 370 307
Average recorded investment 835 918
Interest income recognized 30 24
Commercial Portfolio Segment [Member] | Construction Industry [Member]    
Loans with no related allowance recorded:    
Recorded investment, with no related allowance 0 80
Unpaid principal balance, with no related allowance 79 198
Related allowance 0 0
Average recorded investment, with no related allowance 28 87
Interest income recognized, with no related allowance 0 0
Loans with an allowance recorded:    
Recorded investment, with related allowance 0 0
Unpaid principal balance, with related allowance 0 0
Related allowance 0 0
Average recorded investment, with related allowance 0 0
Interest income recognized, with related allowance 0 0
Total:    
Recorded investment 0 80
Unpaid principal balance 79 198
Related allowance 0 0
Average recorded investment 28 87
Interest income recognized 0 0
Commercial Portfolio Segment [Member] | Commercial Business Other [Member]    
Loans with no related allowance recorded:    
Recorded investment, with no related allowance 0 0
Unpaid principal balance, with no related allowance 0 0
Related allowance 0 0
Average recorded investment, with no related allowance 8 0
Interest income recognized, with no related allowance 0 0
Loans with an allowance recorded:    
Recorded investment, with related allowance 415 475
Unpaid principal balance, with related allowance 967 1,026
Related allowance 120 127
Average recorded investment, with related allowance 429 887
Interest income recognized, with related allowance 20 20
Total:    
Recorded investment 415 475
Unpaid principal balance 967 1,026
Related allowance 120 127
Average recorded investment 437 887
Interest income recognized $ 20 $ 20