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Note 7 - Loans (Details Textual) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Apr. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total | $ 2,492,000 |  | $ 2,482,000 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 11,330,000 | $ 8,256,000 | 9,836,000 |  | $ 9,309,000
Provision for Loan, Lease, and Other Losses, Total | 1,528,000 | $ (957,000) |  |  |
Loans and Leases Receivable, Gross, Total | 1,167,473,000 |  | 1,182,222,000 |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 0 |  | 0 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 |  |  |
Financial Assets Facing Additional Credit Deterioration Due to Economic Impact of Covid-19 [Member] |  |  |  |  |
Provision for Loan, Lease, and Other Losses, Total | $ 402,000 |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 6,089,000 | $ 3,444,000 | 4,788,000 |  | 4,591,000
Loans and Leases Receivable, Gross, Total | 569,331,000 |  | 578,901,000 |  |
Commercial Portfolio Segment [Member] | Maximum [Member] |  |  |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss | 200,000 |  |  |  |
Specific Loans Portfolio Segment [Member] |  |  |  |  |
Provision for Loan, Lease, and Other Losses, Total | 1,210,000 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total | 1,176,000 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total | (34,000) |  |  |  |
Unallocated Financing Receivables [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 585,000 | 585,000 | 585,000 |  | 499,000
Provision for Loan, Lease, and Other Losses, Total |  | 54,000 |  |  |
Loans and Leases Receivable, Gross, Total | 0 |  | 0 |  |
Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 4,383,000 | 3,991,000 | 4,182,000 |  | 3,986,000
Loans and Leases Receivable, Gross, Total | 581,626,000 |  | 586,580,000 |  |
Residential 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 |  | $ 0 |  |
One Real Estate Secured Commercial Loan [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Provision for Loan, Lease, and Other Losses, Total | 1,193,000 |  |  |  |
Loans and Leases Receivable, Gross, Total | $ 3,500,000 |  |  |  |
Loans Upgraded from Substandard to Special Mention in Following Fiscal Year [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  | $ 1,365,000
Number of Loans |  |  |  |  | 2
Loans Receivable 1 [Member] | Credit Availability Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage | 0.00% |  | 0.00% |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Provision for Loan, Lease, and Other Losses, Total |  | $ (1,011,000) |  |  |
Loans and Leases Receivable, Gross, Total | $ 305,000 |  | $ 441,000 |  |
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Loans and Leases Receivable, Gross, Total | 228,000 |  | 364,000 |  |
Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Loans and Leases Receivable, Gross, Total | 77,000 |  | 77,000 |  |
Changes to Experience Factors Used to Estimate Allowance [Member] |  |  |  |  |
Provision for Loan, Lease, and Other Losses, Total | (67,000) |  |  |  |
Impact of Reduction in Loans [Member] |  |  |  |  |
Provision for Loan, Lease, and Other Losses, Total | (17,000) |  |  |  |
Monument Bancorp, Inc [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable |  |  |  | $ 259,295,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable, Market Rate Adjustment |  |  |  | (1,807,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Credit Fair Value Adjustment on Non-credit Impaired Loans |  |  |  | (1,914,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Credit Fair Value Adjustment on Impaired Loans |  |  |  | (318,000) |
Monument Bancorp, Inc [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable |  |  |  | 441,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Credit Fair Value Adjustment on Non-credit Impaired Loans |  |  |  | $ 1,914,000 |
Interest and Fee Income, Loans and Leases, Total | 112,000 |  |  |  |
Allowance for Loan and Lease Losses, Loans Acquired | $ 1,011,000 |  | $ 1,216,000 |  |

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