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Note 3 - Loans - Impaired Loan Data (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Unpaid contractual principal balance with no related allowance | $ 16,972 | $ 18,671 | $ 19,781
Impaired balance with no related allowance | 16,863 | 17,860 | 19,295
Average recorded investment with no related allowance | 17,130 | 19,554 | 19,502
Interest income recognized with no related allowance | 571 | 625 | 882
Interest income collected with no related allowance | 621 | 645 | 901
Unpaid contractual principal balance with an allowance | 6,672 | 8,031 | 6,702
Impaired balance with an allowance | 6,672 | 8,031 | 6,702
Related allowance | 1,487 | 1,585 | 1,827
Average recorded investment with an allowance | 6,383 | 7,947 | 7,698
Interest income recognized with an allowance | 208 | 239 | 278
Interest income collected with an allowance | 210 | 252 | 299
Unpaid contractual principal balance | 23,644 | 26,702 | 26,483
Impaired balance | 23,535 | 25,891 | 25,997
Average recorded investment | 23,513 | 27,501 | 27,200
Interest income recognized | 779 | 864 | 1,160
Interest income collected | 831 | 897 | 1,200
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 472 | 653 | 599
Impaired balance with no related allowance | 472 | 653 |
Average recorded investment with no related allowance | 508 | 642 | 634
Interest income recognized with no related allowance | 13 | 28 | 33
Interest income collected with no related allowance | 15 | 28 | 34
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 | 472 | 653 | 599
Impaired balance | 472 | 653 | 599
Average recorded investment | 508 | 642 | 634
Interest income recognized | 13 | 28 | 33
Interest income collected | 15 | 28 | 34
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 444 | 342 | 485
Impaired balance with no related allowance | 423 | 322 | 398
Average recorded investment with no related allowance | 375 | 271 | 297
Interest income recognized with no related allowance | 14 | 5 | 11
Interest income collected with no related allowance | 21 | 12 | 19
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 | 444 | 342 | 485
Impaired balance | 423 | 322 | 398
Average recorded investment | 375 | 271 | 297
Interest income recognized | 14 | 5 | 11
Interest income collected | 21 | 12 | 19
Real Estate Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 9,758 | 10,775 | 12,637
Impaired balance with no related allowance | 9,758 | 10,775 | 12,637
Average recorded investment with no related allowance | 10,759 | 12,851 | 12,808
Interest income recognized with no related allowance | 345 | 368 | 560
Interest income collected with no related allowance | 352 | 356 | 550
Unpaid contractual principal balance with an allowance | 5,800 | 7,124 | 5,729
Impaired balance with an allowance | 5,800 | 7,124 | 5,729
Related allowance | 1,394 | 1,471 | 1,713
Average recorded investment with an allowance | 5,478 | 6,817 | 6,599
Interest income recognized with an allowance | 185 | 201 | 229
Interest income collected with an allowance | 187 | 202 | 237
Unpaid contractual principal balance | 15,558 | 17,899 | 18,366
Impaired balance | 15,558 | 17,899 | 18,366
Average recorded investment | 16,237 | 19,668 | 19,407
Interest income recognized | 530 | 569 | 789
Interest income collected | 539 | 558 | 787
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 102 | 176 | 54
Impaired balance with no related allowance | 102 | 176 | 54
Average recorded investment with no related allowance | 54 | 163 | 141
Interest income recognized with no related allowance | 3 | 4 | 3
Interest income collected with no related allowance | 3 | 5 | 4
Unpaid contractual principal balance with an allowance | 471 | 497 | 493
Impaired balance with an allowance | 471 | 497 | 493
Related allowance | 44 | 69 | 66
Average recorded investment with an allowance | 483 | 178 | 241
Interest income recognized with an allowance | 3 | 22 | 23
Interest income collected with an allowance | 3 | 32 | 33
Unpaid contractual principal balance | 573 | 673 | 547
Impaired balance | 573 | 673 | 547
Average recorded investment | 537 | 341 | 382
Interest income recognized | 6 | 26 | 26
Interest income collected | 6 | 37 | 37
Real Estate Portfolio Segment [Member] | Residential Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 0 | 198 | 0
Impaired balance with no related allowance | 0 | 198 | 0
Average recorded investment with no related allowance | 0 | 99 | 79
Interest income recognized with no related allowance | 0 | 5 | 0
Interest income collected with no related allowance | 0 | 5 | 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 | 198 | 0
Impaired balance | 0 | 198 | 0
Average recorded investment | 0 | 99 | 79
Interest income recognized | 0 | 5 | 0
Interest income collected | 0 | 5 | 0
Real Estate Portfolio Segment [Member] | Residential [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 3,954 | 5,506 | 4,978
Impaired balance with no related allowance | 3,868 | 4,718 | 4,580
Average recorded investment with no related allowance | 4,052 | 4,563 | 4,566
Interest income recognized with no related allowance | 141 | 156 | 212
Interest income collected with no related allowance | 145 | 176 | 227
Unpaid contractual principal balance with an allowance | 35 | 37 | 109
Impaired balance with an allowance | 35 | 37 | 109
Related allowance | 20 | 21 | 27
Average recorded investment with an allowance | 54 | 575 | 482
Interest income recognized with an allowance | 2 | (1) | 4
Interest income collected with an allowance | 2 | 2 | 7
Unpaid contractual principal balance | 3,989 | 5,543 | 5,087
Impaired balance | 3,903 | 4,755 | 4,689
Average recorded investment | 4,106 | 5,138 | 5,048
Interest income recognized | 143 | 155 | 216
Interest income collected | 147 | 178 | 234
Real Estate Portfolio Segment [Member] | Farmland [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 2,067 | 841 | 840
Impaired balance with no related allowance | 2,065 | 839 | 839
Average recorded investment with no related allowance | 1,189 | 779 | 791
Interest income recognized with no related allowance | 46 | 54 | 54
Interest income collected with no related allowance | 75 | 58 | 58
Unpaid contractual principal balance with an allowance | 366 | 373 | 371
Impaired balance with an allowance | 366 | 373 | 371
Related allowance | 29 | 24 | 21
Average recorded investment with an allowance | 368 | 377 | 376
Interest income recognized with an allowance | 18 | 17 | 22
Interest income collected with an allowance | 18 | 16 | 22
Unpaid contractual principal balance | 2,433 | 1,214 | 1,211
Impaired balance | 2,431 | 1,212 | 1,210
Average recorded investment | 1,557 | 1,156 | 1,167
Interest income recognized | 64 | 71 | 76
Interest income collected | 93 | 74 | 80
Consumer and Other Portfolio Segment [Member] | Consumer [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 175 | 180 | 188
Impaired balance with no related allowance | 175 | 179 | 188
Average recorded investment with no related allowance | 193 | 186 | 186
Interest income recognized with no related allowance | 9 | 5 | 9
Interest income collected with no related allowance | 10 | 5 | 9
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 | 175 | 180 | 188
Impaired balance | 175 | 179 | 188
Average recorded investment | 193 | 186 | 186
Interest income recognized | 9 | 5 | 9
Interest income collected | 10 | $ 5 | $ 9
Consumer and Other Portfolio Segment [Member] | Other [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 0 |  |
Impaired balance with no related allowance | 0 |  |
Average recorded investment with no related allowance | 0 |  |
Interest income recognized with no related allowance | 0 |  |
Interest income collected with no related allowance | 0 |  |
Unpaid contractual principal balance with an allowance | 0 |  |
Impaired balance with an allowance | 0 |  |
Related allowance | 0 |  |
Average recorded investment with an allowance | 0 |  |
Interest income recognized with an allowance | 0 |  |
Interest income collected with an allowance | 0 |  |
Unpaid contractual principal balance | 0 |  |
Impaired balance | 0 |  |
Average recorded investment | 0 |  |
Interest income recognized | 0 |  |
Interest income collected | $ 0 |  |

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