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Note 4 - Available-for-sale Securities (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 10 | 9
Number of Available-for-sale Securities | 16 | 11
Unrealized Holding Losses Depreciation Percentage from Amortized Cost | 4.40% | 1.40%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total | $ 0 |
Available-For-Sale Securities Pledged to Secure Municipal Deposits [Member] |  |
Debt Securities, Available-for-sale, Restricted | 7,000 | $ 6,700
Available-For-Sale Securities Pledged to FRB of New York [Member] |  |
Debt Securities, Available-for-sale, Restricted | 5,500 | $ 6,700
Available-For-Sale Securities Pledged to St. Louis Fed [Member] |  |
Debt Securities, Available-for-sale, Restricted | $ 1,500 |

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- Definition Unrealized holding losses depreciation percentage from amortized cost. + References No definition available. + Details
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- Definition Amount of restricted 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 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
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