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Note 3 - Loans - Impaired Loan Data (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | $ 646,000 | $ 580,000 | $ 454,000
Impaired balance with no related allowance | 646,000 | 573,000 | 454,000
Average recorded investment with no related allowance | 515,000 | 562,000 | 535,000
Interest income recognized with no related allowance | 15,000 | 16,000 | 17,000
Interest income collected with no related allowance | 18,000 | 19,000 | 21,000
Unpaid contractual principal balance with an allowance |  | 91,000 | 123,000
Impaired balance with an allowance | 0 | 91,000 | 123,000
Related allowance | 0 | 91,000 | 95,000
Average recorded investment with an allowance | 38,000 | 92,000 | 100,000
Interest income recognized with an allowance | 0 | 0 | 2,000
Interest income collected with an allowance | 0 | 0 | 3,000
Unpaid contractual principal balance | 646,000 | 671,000 | 577,000
Impaired balance | 646,000 | 664,000 | 577,000
Average recorded investment | 553,000 | 654,000 | 635,000
Interest income recognized | 15,000 | 16,000 | 19,000
Interest income collected | 18,000 | 19,000 | 24,000
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 301,000 | 174,000 | 196,000
Impaired balance with no related allowance | 280,000 | 156,000 | 178,000
Average recorded investment with no related allowance | 211,000 | 158,000 | 163,000
Interest income recognized with no related allowance | 5,000 | (10,000) | (10,000)
Interest income collected with no related allowance | 13,000 | 10,000 | 10,000
Unpaid contractual principal balance with an allowance |  | 0 | 0
Impaired balance with an allowance | 0 | 0 | 0
Related allowance | 0 | 0 | 0
Average recorded investment with an allowance | 0 | 0 | 0
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 301,000 | 174,000 | 196,000
Impaired balance | 280,000 | 156,000 | 178,000
Average recorded investment | 211,000 | 158,000 | 163,000
Interest income recognized | 5,000 | (10,000) | (10,000)
Interest income collected | 13,000 | 10,000 | 10,000
Real Estate Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 16,457,000 | 14,412,000 | 15,569,000
Impaired balance with no related allowance | 16,367,000 | 14,412,000 | 15,122,000
Average recorded investment with no related allowance | 14,274,000 | 15,533,000 | 15,430,000
Interest income recognized with no related allowance | 490,000 | 412,000 | 529,000
Interest income collected with no related allowance | 480,000 | 418,000 | 531,000
Unpaid contractual principal balance with an allowance | 8,316,000 | 6,941,000 | 8,969,000
Impaired balance with an allowance | 8,316,000 | 6,282,000 | 8,956,000
Related allowance | 2,470,000 | 243,000 | 1,608,000
Average recorded investment with an allowance | 8,308,000 | 5,912,000 | 6,673,000
Interest income recognized with an allowance | 177,000 | 132,000 | 214,000
Interest income collected with an allowance | 173,000 | 123,000 | 209,000
Unpaid contractual principal balance | 24,773,000 | 21,353,000 | 24,538,000
Impaired balance | 24,683,000 | 20,694,000 | 24,078,000
Average recorded investment | 22,582,000 | 21,445,000 | 22,103,000
Interest income recognized | 667,000 | 544,000 | 743,000
Interest income collected | 653,000 | 541,000 | 740,000
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 508,000 | 7,726,000 | 6,888,000
Impaired balance with no related allowance | 508,000 | 2,736,000 | 1,898,000
Average recorded investment with no related allowance | 825,000 | 3,191,000 | 2,867,000
Interest income recognized with no related allowance | 16,000 | 17,000 | 26,000
Interest income collected with no related allowance | 15,000 | 17,000 | 27,000
Unpaid contractual principal balance with an allowance | 73,000 | 78,000 | 77,000
Impaired balance with an allowance | 73,000 | 78,000 | 76,000
Related allowance | 22,000 | 14,000 | 25,000
Average recorded investment with an allowance | 74,000 | 97,000 | 92,000
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 581,000 | 7,804,000 | 6,965,000
Impaired balance | 581,000 | 2,814,000 | 1,974,000
Average recorded investment | 899,000 | 3,288,000 | 2,959,000
Interest income recognized | 16,000 | 17,000 | 26,000
Interest income collected | 15,000 | 17,000 | 27,000
Real Estate Portfolio Segment [Member] | Residential Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 0 | 0 |
Impaired balance with no related allowance | 0 | 0 |
Average recorded investment with no related allowance | 0 | 0 |
Interest income recognized with no related allowance | 0 | 0 |
Interest income collected with no related allowance | 0 | 0 |
Unpaid contractual principal balance with an allowance | 0 | 0 |
Impaired balance with an allowance | 0 | 0 |
Related allowance | 0 | 0 |
Average recorded investment with an allowance | 0 | 0 |
Interest income recognized with an allowance | 0 | 0 |
Interest income collected with an allowance | 0 | 0 |
Unpaid contractual principal balance | 0 | 0 |
Impaired balance | 0 | 0 |
Average recorded investment | 0 | 0 |
Interest income recognized | 0 | 0 |
Interest income collected | 0 | 0 |
Real Estate Portfolio Segment [Member] | Residential [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 5,321,000 | 5,359,000 | 5,429,000
Impaired balance with no related allowance | 4,995,000 | 4,400,000 | 4,576,000
Average recorded investment with no related allowance | 4,704,000 | 4,761,000 | 4,715,000
Interest income recognized with no related allowance | 56,000 | 165,000 | 176,000
Interest income collected with no related allowance | 178,000 | 148,000 | 159,000
Unpaid contractual principal balance with an allowance | 858,000 | 1,082,000 | 1,083,000
Impaired balance with an allowance | 851,000 | 1,082,000 | 1,075,000
Related allowance | 435,000 | 308,000 | 308,000
Average recorded investment with an allowance | 936,000 | 1,093,000 | 1,089,000
Interest income recognized with an allowance | 4,000 | 12,000 | 16,000
Interest income collected with an allowance | 6,000 | 12,000 | 16,000
Unpaid contractual principal balance | 6,179,000 | 6,441,000 | 6,512,000
Impaired balance | 5,846,000 | 5,482,000 | 5,651,000
Average recorded investment | 5,640,000 | 5,854,000 | 5,804,000
Interest income recognized | 60,000 | 177,000 | 192,000
Interest income collected | 184,000 | 160,000 | 175,000
Real Estate Portfolio Segment [Member] | Farmland [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 921,000 | 1,398,000 | 1,105,000
Impaired balance with no related allowance | 919,000 | 1,397,000 | 1,103,000
Average recorded investment with no related allowance | 1,071,000 | 1,419,000 | 1,340,000
Interest income recognized with no related allowance | (4,000) | 1,000 | 1,000
Interest income collected with no related allowance | 1,000 | 2,000 | 2,000
Unpaid contractual principal balance with an allowance | 382,000 | 390,000 | 388,000
Impaired balance with an allowance | 382,000 | 390,000 | 388,000
Related allowance | 33,000 | 57,000 | 37,000
Average recorded investment with an allowance | 385,000 | 392,000 | 391,000
Interest income recognized with an allowance | 16,000 | 16,000 | 21,000
Interest income collected with an allowance | 14,000 | 16,000 | 21,000
Unpaid contractual principal balance | 1,303,000 | 1,788,000 | 1,493,000
Impaired balance | 1,301,000 | 1,787,000 | 1,491,000
Average recorded investment | 1,456,000 | 1,811,000 | 1,731,000
Interest income recognized | 12,000 | 17,000 | 22,000
Interest income collected | 15,000 | 18,000 | 23,000
Consumer and Other Portfolio Segment [Member] | Consumer [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 241,000 | 195,000 | 180,000
Impaired balance with no related allowance | 241,000 | 187,000 | 178,000
Average recorded investment with no related allowance | 214,000 | 195,000 | 191,000
Interest income recognized with no related allowance | 7,000 | 8,000 | 14,000
Interest income collected with no related allowance | 9,000 | 11,000 | 15,000
Unpaid contractual principal balance with an allowance | 0 | 0 | 0
Impaired balance with an allowance | 0 | 0 | 0
Related allowance | 0 | 0 | 0
Average recorded investment with an allowance | 0 | 0 | 0
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 241,000 | 195,000 | 180,000
Impaired balance | 241,000 | 187,000 | 178,000
Average recorded investment | 214,000 | 195,000 | 191,000
Interest income recognized | 7,000 | 8,000 | 14,000
Interest income collected | 9,000 | 11,000 | 15,000
Consumer and Other Portfolio Segment [Member] | Other [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 0 | 0 | 0
Impaired balance with no related allowance | 0 | 0 | 0
Average recorded investment with no related allowance | 0 | 65,000 | 48,000
Interest income recognized with no related allowance | 0 | 0 | 0
Interest income collected with no related allowance | 0 | 0 | 0
Unpaid contractual principal balance with an allowance | 0 | 0 | 0
Impaired balance with an allowance | 0 | 0 | 0
Related allowance | 0 | 0 | 0
Average recorded investment with an allowance | 0 | 0 | 0
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 0 | 0 | 0
Impaired balance | 0 | 0 | 0
Average recorded investment | 0 | 65,000 | 48,000
Interest income recognized | 0 | 0 | 0
Interest income collected | 0 | 0 | 0
Unpaid contractual principal balance with no related allowance | 24,395,000 | 29,844,000 | 29,821,000
Impaired balance with no related allowance | 23,956,000 | 23,861,000 | 23,509,000
Average recorded investment with no related allowance | 21,814 | 25,884,000 | 25,289,000
Interest income recognized with no related allowance | 585,000 | 609,000 | 753,000
Interest income collected with no related allowance | 714,000 | 625,000 | 765,000
Unpaid contractual principal balance with an allowance | 9,629,000 | 8,582,000 | 10,640,000
Impaired balance with an allowance | 9,622,000 | 7,923,000 | 10,618,000
Related allowance | 2,960,000 | 713,000 | 2,073,000
Average recorded investment with an allowance | 9,741,000 | 7,586,000 | 8,345,000
Interest income recognized with an allowance | 197,000 | 160,000 | 253,000
Interest income collected with an allowance | 193,000 | 151,000 | 249,000
Unpaid contractual principal balance | 34,024,000 | 38,426,000 | 40,461,000
Impaired balance | 33,578,000 | 31,784,000 | 34,127,000
Average recorded investment | 31,555,000 | 33,470,000 | 33,634,000
Interest income recognized | 782,000 | 769,000 | 1,006,000
Interest income collected | $ 907,000 | $ 776,000 | $ 1,014,000

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