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Note 4 - Available-for-sale Securities (Details Textual) |  | 6 Months Ended |
--- | --- | --- | ---
May 10, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions |  | 10 |  | 9
Number of Available-for-sale Securities |  | 12 |  | 11
Unrealized Holding Losses Depreciation Percentage from Amortized Cost |  | 5.00% |  | 1.40%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total |  | $ 0 |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  | 0 | $ 13,800,000 |
Debt Securities, Available-for-sale, Realized Gain (Loss), Total |  |  | (78,000) |
Payments to Acquire Debt Securities, Available-for-sale |  | 0 | $ 15,600,000 |
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 the Federal Reserve Bank of New York to Secure Municipal Deposits [Member] |  |  |  |
Debt Securities, Available-for-sale, Restricted |  | $ 6,200,000 |  | $ 6,700,000

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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/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&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=109979856&loc=SL6284422-111562 + Details
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