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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans by Loan Category (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Recorded Investment with no related allowance recorded | $ 3,958 | $ 2,728 | $ 510
Unpaid Principal Balance with no related allowance recorded | 4,969 | 3,398 | 556
Average Recorded Investment with no related allowance recorded | 2,404 | 1,165 | 631
Interest Income Recognized with no related allowance recorded | 19 | 53 | 154
Recorded Investment with an allowance recorded | 3,893 | 3,194 | 3,514
Unpaid Principal Balance with an allowance recorded | 3,986 | 3,323 | 3,652
Related Allowance | 431 | 355 | 297
Average Recorded Investment with an allowance recorded | 3,506 | 3,983 | 3,731
Interest Income Recognized with an allowance recorded | 134 | 116 | 19
Recorded Investment | 7,851 | 5,922 | 4,024
Unpaid Principal Balance | 8,955 | 6,721 | 4,209
Average Recorded Investment | 5,910 | 5,148 | 4,362
Interest Income Recognized with an allowance recorded | 153 | 169 | 173
Agricultural [Member] |  |  |
Recorded Investment with no related allowance recorded | 348 | 545 | 185
Unpaid Principal Balance with no related allowance recorded | 434 | 545 | 185
Average Recorded Investment with no related allowance recorded | 329 | 146 | 291
Interest Income Recognized with no related allowance recorded | 0 | 10 | 0
Recorded Investment with an allowance recorded | 0 | 379 | 393
Unpaid Principal Balance with an allowance recorded | 0 | 439 | 440
Related Allowance | 0 | 103 | 94
Average Recorded Investment with an allowance recorded | 152 | 388 | 161
Interest Income Recognized with an allowance recorded | 0 | 0 | 13
Recorded Investment | 348 | 924 | 578
Unpaid Principal Balance | 434 | 984 | 625
Average Recorded Investment | 481 | 534 | 452
Interest Income Recognized with an allowance recorded | 0 | 10 | 13
Commercial and Industrial [Member] |  |  |
Recorded Investment with no related allowance recorded | 1,516 | 259 | 0
Unpaid Principal Balance with no related allowance recorded | 1,629 | 340 | 0
Average Recorded Investment with no related allowance recorded | 464 | 104 | 29
Interest Income Recognized with no related allowance recorded | 2 | 9 | 2
Recorded Investment with an allowance recorded | 147 | 0 | 21
Unpaid Principal Balance with an allowance recorded | 147 | 0 | 21
Related Allowance | 19 | 0 | 3
Average Recorded Investment with an allowance recorded | 111 | 86 | 296
Interest Income Recognized with an allowance recorded | 12 | 1 | 0
Recorded Investment | 1,663 | 259 | 21
Unpaid Principal Balance | 1,776 | 340 | 21
Average Recorded Investment | 575 | 190 | 325
Interest Income Recognized with an allowance recorded | 14 | 10 | 2
Consumer Portfolio Segment [Member] |  |  |
Recorded Investment with no related allowance recorded | 0 | 0 | 1
Unpaid Principal Balance with no related allowance recorded | 0 | 0 | 1
Average Recorded Investment with no related allowance recorded | 1 | 0 | 2
Interest Income Recognized with no related allowance recorded | 0 | 0 | 8
Recorded Investment with an allowance recorded | 8 | 17 | 88
Unpaid Principal Balance with an allowance recorded | 8 | 18 | 88
Related Allowance | 1 | 4 | 13
Average Recorded Investment with an allowance recorded | 16 | 48 | 59
Interest Income Recognized with an allowance recorded | 0 | 0 | 0
Recorded Investment | 8 | 17 | 90
Unpaid Principal Balance | 8 | 18 | 90
Average Recorded Investment | 17 | 48 | 61
Interest Income Recognized with an allowance recorded | 0 | 0 | 8
Construction Real Estate [Member] |  |  |
Recorded Investment with no related allowance recorded | 80 | 0 | 0
Unpaid Principal Balance with no related allowance recorded | 80 | 0 | 0
Average Recorded Investment with no related allowance recorded | 16 | 0 | 54
Interest Income Recognized with no related allowance recorded | 0 | 0 | 0
Recorded Investment with an allowance recorded | 0 | 0 | 0
Unpaid Principal Balance with an allowance recorded | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment with an allowance recorded | 0 | 0 | 0
Interest Income Recognized with an allowance recorded | 0 | 0 | 0
Recorded Investment | 80 | 0 | 0
Unpaid Principal Balance | 80 | 0 | 0
Average Recorded Investment | 16 | 0 | 54
Interest Income Recognized with an allowance recorded | 0 | 0 | 0
Commercial Real Estate Portfolio Segment [Member] |  |  |
Recorded Investment with no related allowance recorded | 1,852 | 1,882 | 74
Unpaid Principal Balance with no related allowance recorded | 2,664 | 2,471 | 109
Average Recorded Investment with no related allowance recorded | 1,495 | 782 | 78
Interest Income Recognized with no related allowance recorded | 14 | 30 | 30
Recorded Investment with an allowance recorded | 1,180 | 406 | 550
Unpaid Principal Balance with an allowance recorded | 1,180 | 406 | 609
Related Allowance | 157 | 13 | 20
Average Recorded Investment with an allowance recorded | 897 | 975 | 692
Interest Income Recognized with an allowance recorded | 35 | 32 | 0
Recorded Investment | 3,032 | 2,288 | 623
Unpaid Principal Balance | 3,844 | 2,877 | 718
Average Recorded Investment | 2,392 | 1,757 | 770
Interest Income Recognized with an allowance recorded | 49 | 62 | 30
Residential Portfolio Segment [Member] |  |  |
Recorded Investment with no related allowance recorded | 162 | 42 | 250
Unpaid Principal Balance with no related allowance recorded | 162 | 42 | 261
Average Recorded Investment with no related allowance recorded | 99 | 133 | 177
Interest Income Recognized with no related allowance recorded | 3 | 4 | 114
Recorded Investment with an allowance recorded | 2,558 | 2,392 | 2,462
Unpaid Principal Balance with an allowance recorded | 2,651 | 2,460 | 2,494
Related Allowance | 254 | 235 | 167
Average Recorded Investment with an allowance recorded | 2,330 | 2,486 | 2,523
Interest Income Recognized with an allowance recorded | 87 | 83 | 6
Recorded Investment | 2,720 | 2,434 | 2,712
Unpaid Principal Balance | 2,813 | 2,502 | 2,755
Average Recorded Investment | 2,429 | 2,619 | 2,700
Interest Income Recognized with an allowance recorded | $ 90 | $ 87 | $ 120

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