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Note 10 - FHLB Advances (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Advances from Federal Home Loan Banks Shortterm | $ 165,400,000 | $ 104,500,000
Federal Home Loan Bank Stock | $ 11,676,700 | $ 9,271,300
Minimum [Member] |  |
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate | 1 day | 1 day
Minimum [Member] | Loans Receivable [Member] |  |
FHLB Collateral Maintenance Levels | 125.00% |
Maximum [Member] |  |
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate | 30 days | 30 days
Maximum [Member] | Loans Receivable [Member] |  |
FHLB Collateral Maintenance Levels | 333.00% |
Collateral, Loans [Member] |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | $ 850,115,910 | $ 669,513,037
Collateral, Securities [Member] |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | $ 6,690,525 |

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- Definition Amount of short-term borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References No definition available. + Details
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- Definition Represents FHLB collateral maintenance levels. + References No definition available. + Details
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Maturity period on fixed rate advances made and reported by Federal Home Loan Bank (FHLBank), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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