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Note 3 - Available-for-sale Securities (Details Textual) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 13 |  | 10
Number of Available-for-sale Securities | 25 |  | 16
Unrealized Holding Losses Depreciation Percentage from Amortized Cost | 5.60% |  | 4.40%
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total | $ 0 |  |
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total | 0 |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 0 | $ 0 |
Subordinated Notes [Member] |  |  |
Payments to Acquire Debt Securities, Available-for-sale | 3,500,000 |  |
Corporate Debt Securities [Member] |  |  |
Payments to Acquire Debt Securities, Available-for-sale | 4,000,000 |  |
SBA Loan Pools [Member] |  |  |
Payments to Acquire Debt Securities, Available-for-sale | 5,500,000 |  |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Payments to Acquire Debt Securities, Available-for-sale |  | 15,600,000 |
US Treasury Securities [Member] |  |  |
Payments to Acquire Debt Securities, Available-for-sale |  | 1,500,000 |
Securities Acquired in Business Acquisition [Member] |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  | 35,500,000 |
Debt Securities, Available-for-sale, Realized Gain (Loss), Total |  | $ 0 |
Available-For-Sale Securities Pledged to Secure Municipal Deposits [Member] |  |  |
Debt Securities, Available-for-sale, Restricted | 5,000,000 |  | $ 7,000,000
Available-For-Sale Securities Pledged to FRB of New York [Member] |  |  |
Debt Securities, Available-for-sale, Restricted | 5,000,000 |  | 5,500,000
Available-For-Sale Securities Pledged to St. Louis Fed [Member] |  |  |
Debt Securities, Available-for-sale, Restricted | $ 0 |  | $ 1,500,000

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- Definition Amount of realized gain (loss) on 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + 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 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=118954083&loc=SL6284422-111562 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References No definition available. + Details
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