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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number of Reportable Segments | 1 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | $ 9,836,000 | $ 9,309,000 | $ 8,856,000
Financing Receivable Individually Evaluated for Impairment Estimated Loss Trigger | 100,000 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 0 |  |
Assets Under Management Fair Value | $ 1,007,113,000 | 862,517,000 |
Trust Revenue Earned and Collected Monthly, Percent | 82.00% |  |
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | $ 4,788,000 | 4,591,000 | 4,235,000
Commercial Portfolio Segment [Member] | Maximum [Member] |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss | 200,000 |  |
Residential Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 4,182,000 | 3,986,000 | 3,963,000
Residential Portfolio Segment [Member] | Maximum [Member] |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss | 400,000 |  |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 281,000 | 233,000 | $ 159,000
Consumer Portfolio Segment [Member] | Maximum [Member] |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss | $ 400,000 |  |
Unfunded Loan Commitment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  | $ 0 |

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