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Note 8 - Deposits (Details Textual) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Deposit Liabilities, Accrued Interest | $ 4.4 | $ 2.9 | $ 3.4
Geographic Distribution, Domestic [Member] |  |  |
Time Deposits, at or Above FDIC Insurance Limit | 1,900.0 | 1,800.0 |
Geographic Distribution, Foreign [Member] |  |  |
Time Deposits, at or Above FDIC Insurance Limit | $ 152.0 | $ 137.7 |

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- Definition Amount of accrued but unpaid interest on deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 + Details
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