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Note 12 - Fair Value Measurements - Carrying Values and Estimated Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair value, available for sale securities |  | $ 128,660 | $ 120,983
Securities held to maturity |  | 17,086 |
Restricted securities |  | 1,848 | 1,806
Bank owned life insurance |  | 17,562 | 17,447
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, available for sale securities |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, available for sale securities |  |  | 120,983
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value, available for sale securities |  |  |
Reported Value Measurement [Member] |  |  |
Cash and short-term investments |  | 48,090 | 45,785
Fair value, available for sale securities |  | 128,660 | 120,983
Securities held to maturity |  | 17,086 | 17,627
Restricted securities |  | 1,848 | 1,806
Loans held for sale |  | 621 | 167
Loans, net | [1] | 576,283 | 569,412
Bank owned life insurance |  | 17,562 | 17,447
Accrued interest receivable |  | 2,124 | 2,065
Deposits |  | 720,627 | 706,442
Subordinated debt |  | 4,987 | 4,983
Junior subordinated debt |  | 9,279 | 9,279
Accrued interest payable |  | 169 | 184
Estimate of Fair Value Measurement [Member] |  |  |
Cash and short-term investments |  | 48,090 | 45,785
Fair value, available for sale securities |  | 128,660 | 120,983
Securities held to maturity |  | 17,626 | 17,646
Restricted securities |  | 1,848 | 1,806
Loans held for sale |  | 621 | 167
Loans, net | [1] | 581,013 | 572,910
Bank owned life insurance |  | 17,562 | 17,447
Accrued interest receivable |  | 2,124 | 2,065
Deposits |  | 721,555 | 705,949
Subordinated debt |  | 5,489 | 5,023
Junior subordinated debt |  | 8,510 | 9,724
Accrued interest payable |  | 169 | 184
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and short-term investments |  | 48,090 | 45,785
Fair value, available for sale securities |  |  |
Securities held to maturity |  |  |
Restricted securities |  |  |
Loans held for sale |  |  |
Loans, net | [1] |  |
Bank owned life insurance |  |  |
Accrued interest receivable |  |  |
Deposits |  |  |
Subordinated debt |  |  |
Junior subordinated debt |  |  |
Accrued interest payable |  |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and short-term investments |  |  |
Fair value, available for sale securities |  | 128,660 | 120,983
Securities held to maturity |  | 15,972 | 16,134
Restricted securities |  | 1,848 | 1,806
Loans held for sale |  | 621 | 167
Loans, net | [1] |  |
Bank owned life insurance |  | 17,562 | 17,447
Accrued interest receivable |  | 2,124 | 2,065
Deposits |  | 605,217 | 588,878
Subordinated debt |  |  |
Junior subordinated debt |  |  |
Accrued interest payable |  | 169 | 184
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and short-term investments |  |  |
Fair value, available for sale securities |  |  |
Securities held to maturity |  | 1,654 | 1,512
Restricted securities |  |  |
Loans held for sale |  |  |
Loans, net | [1] | 581,013 | 572,910
Bank owned life insurance |  |  |
Accrued interest receivable |  |  |
Deposits |  | 116,338 | 117,071
Subordinated debt |  | 5,489 | 5,023
Junior subordinated debt |  | 8,510 | 9,724
Accrued interest payable |  |  |
[1] | In accordance with the prospective adoption of ASU No. 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities," the fair value of loans as of December 31, 2018 was measured using an exit price notion. The fair value of loans as of December 31, 2017 was measured using an entry price notion.

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- 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 -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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