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Note 5 - Investments Securities Lending Activity (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) transaction
Securities Financing Transaction [Line Items] |  |  |
Securities Lending Rate of Collateral Required |  | 1.02 |
Securities Loaned, Asset |  | $ 60,876,000 |
Securities Held as Collateral, at Fair Value |  | 0 |
Cash Collateral for Borrowed Securities |  | $ 36,782,000 | $ 0
Number of Securities Lending Transactions | transaction |  |  | 0
Repurchase Agreements, Securities Lending Transactions, and Repurchase-to-Maturity Transactions Accounted for as Secured Borrowings, Description of Potential Risks |  | Under our securities lending agreements, 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 regularly monitoring our available sources of cash and collateral to ensure we can meet short-term liquidity demands in both normal and stressed scenarios. We may use our general liquidity resources to meet any potential cash demands when loaned securities are returned to us. 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 |
Securities Loaned, Asset | [1] | $ 60,876,000 |
Securities Borrowed, Fair Value of Collateral | [1],[2] | 25,589,000 |
Cash Collateral for Borrowed Securities | [1],[3] | 36,782,000 |
Securities Financing Transaction, Fair Value [Member] | Corporate bonds and notes |  |  |
Securities Financing Transaction [Line Items] |  |  |
Securities Loaned, Asset | [1] | 33,557,000 |
Securities Financing Transaction, Fair Value [Member] | Foreign government securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Securities Loaned, Asset | [1] | 120,000 |
Securities Financing Transaction, Fair Value [Member] | Equity securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Securities Loaned, Asset | [1] | 27,199,000 |
Securities Financing Transaction, Cost [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Securities Loaned, Asset | [1] | $ 60,740,000 |
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 included at fair value within other assets on our condensed consolidated balance sheets. All of our securities lending agreements are classified as overnight and continuous. 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 and collateral agreements and is included in short-term investments. Amounts payable on the return of cash collateral under securities lending agreements are included within other liabilities on 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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