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Note 2 - Investment Securities (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Note 2 - Investment Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 10 |  | 10
Unrealized Holding Losses Depreciation Percentage from Amortized Cost | 0.70% |  | 1.30%
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 0 |  |
Proceeds from Sale of Available-for-sale Securities | 0 | $ 0 |
Municipal Deposits Securities [Member] |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |
Available-for-sale Securities Pledged as Collateral | $ 5,200,000 |  | $ 5,500,000

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5086-111524 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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