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Note 4 - Debt and Equity Securities (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Debt Securities, Trading, and Equity Securities, FV-NI, Total | $ 0 |  | $ 0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total | 0 |  | $ 0
Proceeds from Sale of Available-for-sale Securities, Total | $ 0 | $ 0 |
Collateralized Mortgage Obligations by Commercial Real Estate [Member] |  |  |
Private Issue Collateralized Mortgage Obligations, Number | 0 |  | 1
Mortgage Backed Securities Available for Sale Amortized Cost |  |  | $ 21,000
Mortgage Backed Securities Available for Sale Fair Value |  |  | $ 21,000

X
- Definition The amount of amortized cost on available for sale mortgage backed securities. + References No definition available. + Details
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X
- Definition The amount of fair value of available for sale mortgage backed securities. + References No definition available. + Details
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- Definition The number of privately issued collateralized mortgage obligations. + 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 No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Details
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