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Note 4 - Debt and Equity Securities (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Collateralized By Commercial Real Estate [Member] | Collateralized Mortgage Obligations [Member] |  |  |  |  |
Mortgage Backed Securities Available for Sale Fair Value | $ 400,000 |  | $ 400,000 |  | $ 7,700,000
Mortgage Backed Securities Available for Sale Amortized Cost | 400,000 |  | 400,000 |  | 7,700,000
Proceeds from Sale of Available-for-sale Securities | 0 | $ 138,000,000 | 64,600,000 | $ 163,000,000 |
Trading Securities | $ 0 |  | 0 |  | 0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities |  |  | $ 0 |  | $ 0

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- Definition The amount of amortized cost on available for sale mortgage backed securities. + References No definition available. + Details
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- Definition The amount of fair value of available for sale mortgage backed securities. + References No definition available. + 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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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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