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Note 11 - Cash Surrender Value of Bank-owned Life Insurance (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Bank Owned Life Insurance Income |  |  | $ 439,000
Life Insurance, Corporate or Bank Owned, Change in Value |  |  | (22,464,000)
Life Insurance Policies, Charges |  |  | 892,000
Non-interest Income [Member] |  |  |
Life Insurance Policies, Charges |  |  | 455,000
Non-interest Expense [Member] |  |  |
Life Insurance Policies, Charges |  |  | 437,000
Provision for Income Taxes [Member] |  |  |
Life Insurance Policies, Charges |  |  | $ 1,700,000

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- Definition Charges made to income that originate from liquidation of life insurance policies held by the bank. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6384439&loc=d3e42048-111605 + Details
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- Details
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