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Note 17 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended | 31 Months Ended | 255 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | May 31, 2018
Minimum Number of Years Allowed to Participate in Employee Stock Ownership Plan (Year) | 2 years |  |  |  |
Stock Issued During Period, Shares, Employee Stock Ownership Plan (in shares) | 32,128 | 22,933 | 17,559 |  |
Stock Issued During Period, Value, Employee Stock Ownership Plan | $ 818 | $ 827 | $ 706 |  |
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares (in shares) | 33,629 | 22,309 | 58,988 | 33,629 |
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total (in shares) | 777,128 |  |  | 777,128 |
Percentage of Outstanding Common Stock under Employee Stock Ownership Plan | 1.00% |  |  | 1.00% |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  |  | 75.00%
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, Less Than Two Years of Service |  |  |  |  | 0.00%
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, After Two Years of Service |  |  |  |  | 25.00%
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, After Two Years of Service, Increment |  |  |  |  | 25.00%
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, After Five Years of Service |  |  |  |  | 100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  |  | 100.00% |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  |  |  | 5.00% |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 3,700 | $ 3,500 | $ 3,100 |  |
Percentage of Participant Borrowing Capacity of Vested Amount | 50.00% |  |  |  |
Cash Surrender Value of Life Insurance | $ 52,200 |  |  | $ 52,200 |
Maximum [Member] |  |  |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service | 50 |  |  |  |
Minimum [Member] |  |  |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service | $ 1 |  |  |  |

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- Definition Percentage of matching contributions for employee who is in service five years. + References No definition available. + Details
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- Definition Percentage of matching contributions for employee who is in service two years. + References No definition available. + Details
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- Definition The increment annual vesting percentage of matching contributions for employee who is in service after two year until 100% is vested after years of service. + References No definition available. + Details
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- Definition Minimum number of years allowed to participate in employee stock ownership plan. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The amount of cash provided by the employer through contributions or dividends that the ESOP used in the period to repay debt and interest on a third-party loan made directly to the ESOP. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16545-113920 + Details
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- Definition The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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