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Note 6 - Debt and Equity Securities (Details Textual) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Trading Securities | $ 0 | $ 0 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | 0 | 0 |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | 0 | 0 | $ 0
Proceeds from Sale of Available-for-sale Securities | 112,400,000 | 126,000,000 | $ 163,000,000
Non-qualified Deferred Compensation Plan [Member] | Other Assets [Member] |  |  |
Deferred Compensation Plan, Amounts Held in Rabbi Trust | $ 17,000,000 | $ 15,700,000 |
Collateralized By Commercial Real Estate [Member] | Collateralized Mortgage Obligations [Member] |  |  |
Private Issue Collateralized Mortgage Obligations, Number | 1 | 1 |
Mortgage Backed Securities Available for Sale Amortized Cost | $ 21,000 | $ 200,000 |
Mortgage Backed Securities Available for Sale Fair Value | $ 21,000 | $ 200,000 |

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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 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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