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Note 12 - Regulatory and Operational Matters (Details Textual) $ in Millions | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jan. 22, 2019 | Jan. 01, 2019 | Jan. 01, 2015
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Community Bank, Tier One Leverage Ratio |  |  | 0.09 |  |  |
Community Bank, Tier One Leverage Capital Required for Capital Adequacy |  |  | $ 10,000.0 |  |  |
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum | 0.11 | 0.11 | 0.1 |  |  |
Banking Regulation, Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum |  |  | 0.08 |  |  |
Common Equity, Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets |  |  | 0.065 |  | 0.07 |
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 0.09 | 0.09 | 0.09 | 0.09 |  |
Capital Conservation Buffer |  |  |  |  |  | 0.025
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum |  |  |  | 0.11 | 0.105 |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets with Capital Buffer |  |  |  |  | 0.085 |
Banking Regulation, Tier One Leverage Capital Ratio, Actual | 0.101 | 0.098 |  |  |  |
Banking Regulation, Tier One Leverage Capital, Actual | $ 89.3 | $ 87.8 |  |  |  |
Banking Regulation, Total Capital, Actual | $ 98.5 | $ 97.6 |  |  |  |
Banking Regulation, Total Risk-Based Capital Ratio, Actual | 0.133 | 0.125 |  |  |  |

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- Definition An additional amount held in risk-based capital designed to ensure that banks build up capital buffers outside periods of stress which can be drawn down as losses are incurred. The requirement is based on simple capital conservation rules designed to avoid breaches of minimum capital requirements. + References No definition available. + Details
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- Definition The minimum Common Equity Tier One Capital Ratio (common equity Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition Represents tier one capital required for capital adequacy for community bank. + References No definition available. + Details
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- Definition Represents tier one leverage ratio for community bank. + References No definition available. + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes with capital buffer under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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