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Note 5 - Loans and Allowance for Loan Losses - Individually Impaired Loan (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Principal Balance | $ 18,159 | $ 13,234
Recorded Investment | 17,976 | 13,218
Related Allowance | 436 | 0
Construction And Land Development Loans [Member] |  |
Principal Balance, With no related allowance recorded | 761 | 264
Recorded Investment, With no related allowance recorded | 761 | 264
Commercial and Industrial Sector [Member] |  |
Principal Balance, With no related allowance recorded | 1,764 |
Recorded Investment, With no related allowance recorded | 1,713 |
Principal Balance, With related allowance recorded | 430 |
Recorded Investment, With related allowance recorded | 412 |
Related Allowance, with related allowance recorded | 430 |
Commercial Real Estate [Member] |  |
Principal Balance, With no related allowance recorded | 2,611 | 2,198
Recorded Investment, With no related allowance recorded | 2,611 | 2,197
Residential Mortgage [Member] |  |
Principal Balance, With no related allowance recorded | 2,846 | 1,349
Recorded Investment, With no related allowance recorded | 2,747 | 1,334
Small Business Administration Loans [Member] | Commercial Portfolio Segment [Member] |  |
Principal Balance, With no related allowance recorded | 9,695 | 9,423
Recorded Investment, With no related allowance recorded | 9,680 | 9,423
Recorded Investment, With related allowance recorded |  | 0
Related Allowance, with related allowance recorded |  | $ 0
Other Financing Receivables [Member] |  |
Principal Balance, With no related allowance recorded | 15 |
Recorded Investment, With no related allowance recorded | 15 |
Single Family Residential Mortgages Loans [Member] |  |
Principal Balance, With related allowance recorded | 37 |
Recorded Investment, With related allowance recorded | 37 |
Related Allowance, with related allowance recorded | $ 6 |

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details
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