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Note 9 - Financing Arrangements, Portfolio Investments (Details) - Outstanding Repurchase Agreement Borrowings by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 9 - Financing Arrangements, Portfolio Investments (Details) - Outstanding Repurchase Agreement Borrowings by Contractual Maturity [Line Items]
Outstanding repurchase agreement by contractual maturity	$ 627,881	$ 791,125
Maturity up to 30 days [Member]
Note 9 - Financing Arrangements, Portfolio Investments (Details) - Outstanding Repurchase Agreement Borrowings by Contractual Maturity [Line Items]
Outstanding repurchase agreement by contractual maturity	379,951	509,564
Maturity 30 to 90 Days [Member]
Note 9 - Financing Arrangements, Portfolio Investments (Details) - Outstanding Repurchase Agreement Borrowings by Contractual Maturity [Line Items]
Outstanding repurchase agreement by contractual maturity	181,544	281,561
Maturity over 90 days [Member]
Note 9 - Financing Arrangements, Portfolio Investments (Details) - Outstanding Repurchase Agreement Borrowings by Contractual Maturity [Line Items]
Outstanding repurchase agreement by contractual maturity	$ 66,386

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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