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Note 13 - Fair Value and Interest Rate Risk - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale securities	$ 57,893	$ 49,262
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities	22,687	16,833
Corporate Debt Securities [Member]
Available-for-sale securities	17,333	17,290
Subordinated Notes [Member]
Available-for-sale securities	9,149	9,005
SBA Loan Pools [Member]
Available-for-sale securities	8,165	5,567
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	559	567
Fair Value, Recurring [Member]
Available-for-sale securities	57,893	49,262
Interest rate swap receivable	791	1,187
Interest rate swap liability	791	1,187
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities	22,687	16,833
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities	17,333	17,290
Fair Value, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities	9,149	9,005
Fair Value, Recurring [Member] | SBA Loan Pools [Member]
Available-for-sale securities	8,165	5,567
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	559	567
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Available-for-sale securities
Interest rate swap receivable
Interest rate swap liability
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | SBA Loan Pools [Member]
Available-for-sale securities
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Available-for-sale securities	57,893	49,262
Interest rate swap receivable	791	1,187
Interest rate swap liability	791	1,187
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities	22,687	16,833
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities	17,333	17,290
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities	9,149	9,005
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | SBA Loan Pools [Member]
Available-for-sale securities	8,165	5,567
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	559	567
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Available-for-sale securities
Interest rate swap receivable
Interest rate swap liability
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | SBA Loan Pools [Member]
Available-for-sale securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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+ References

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