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Note 5 - Investments Securities Lending Activity (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Securities Financing Transaction [Line Items] |  |  |
Securities Lending Rate of Collateral Required |  | 1.02 |
Loaned securities |  | $ 44,396,000 | $ 27,964,000
Securities Held as Collateral, at Fair Value |  | 0 |
Cash Collateral for Borrowed Securities |  | $ 39,077,000 | 19,357,000
Repurchase Agreements, Securities Lending Transactions, and Repurchase-to-Maturity Transactions Accounted for as Secured Borrowings, Description of Potential Risks |  | The Borrower generally may return the loaned securities to us at any time, which would require us to return the collateral within the standard settlement period for the loaned securities on the principal exchange or market in which the securities are traded. We manage this liquidity risk associated with cash collateral by maintaining the cash collateral in a short-term money-market fund with daily availability. The credit risk under these programs is reduced by the amounts of collateral received. On a daily basis, the value of the underlying securities that we have loaned to the Borrowers is compared to the value of cash and securities collateral we received from the Borrowers, and additional cash or securities are requested or returned, as applicable. In addition, we are indemnified against counterparty credit risk by the intermediary. |
Securities Financing Transaction, Fair Value [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Securities Lending Rate of Collateral Required |  | 1.00 |
Loaned securities | [1] | $ 44,396,000 | 27,964,000
Securities Borrowed, Fair Value of Collateral | [1],[2] | 6,345,000 | 9,342,000
Cash Collateral for Borrowed Securities | [1],[3] | 39,077,000 | 19,357,000
Securities Financing Transaction, Fair Value [Member] | US Government Corporations and Agencies Securities [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Loaned securities | [1] | 975,000 | 0
Securities Financing Transaction, Fair Value [Member] | Corporate bonds and notes |  |  |
Securities Financing Transaction [Line Items] |  |  |
Loaned securities | [1] | 15,508,000 | 13,862,000
Securities Financing Transaction, Fair Value [Member] | Foreign government securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Loaned securities | [1] | 904,000 | 867,000
Securities Financing Transaction, Fair Value [Member] | Equity securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Loaned securities | [1] | 27,009,000 | 13,235,000
Securities Financing Transaction, Cost [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Loaned securities | [1] | $ 45,266,000 | $ 27,846,000
Foreign government securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Securities Lending Rate of Collateral Required |  | 1.05 |
[1] | Our securities loaned under securities lending agreements are reported at fair value within other assets in our condensed consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.
[2] | Securities collateral on deposit with us from Borrowers may not be transferred or re-pledged unless the Borrower is in default, and is therefore not reflected in our condensed consolidated financial statements.
[3] | All cash collateral received has been reinvested in accordance with the securities lending agreements and is included in short-term investments in our condensed consolidated balance sheets. Amounts payable on the return of cash collateral under securities lending agreements are included within other liabilities in our condensed consolidated balance sheets.

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- Definition Description of potential risks associated with the agreements and related collateral pledged, including obligations arising from a decline in the fair value of the collateral pledged and how risks are managed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL34722452-111729 + Details
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- Definition Amount, after effects of master netting arrangements, of securities loaned to entities in exchange for collateral offset against a right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 + Details
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