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Note 9 - Financing Arrangements, Portfolio Investments (Details) - Assets Pledged As Collateral (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2013
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Dec. 31, 2012
|
| Financial Instruments Owned and Pledged as Collateral [Line Items] |
|
|
| Outstanding Repurchase Agreements |
$ 791,125 |
$ 889,134 |
| Fair Value of Collateral Pledged |
853,223 |
954,656 |
| Amortized Cost Of Collateral Pledged |
887,444 |
958,003 |
|
Agency ARMs [Member]
|
|
|
| Financial Instruments Owned and Pledged as Collateral [Line Items] |
|
|
| Outstanding Repurchase Agreements |
197,974 |
240,440 |
| Fair Value of Collateral Pledged |
208,703 |
253,841 |
| Amortized Cost Of Collateral Pledged |
214,039 |
253,281 |
|
Agency Fixed Rate [Member]
|
|
|
| Financial Instruments Owned and Pledged as Collateral [Line Items] |
|
|
| Outstanding Repurchase Agreements |
489,953 |
566,037 |
| Fair Value of Collateral Pledged |
516,010 |
597,620 |
| Amortized Cost Of Collateral Pledged |
541,580 |
597,769 |
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Agency IOs [Member]
|
|
|
| Financial Instruments Owned and Pledged as Collateral [Line Items] |
|
|
| Outstanding Repurchase Agreements |
94,698 |
74,707 |
| Fair Value of Collateral Pledged |
113,721 |
90,250 |
| Amortized Cost Of Collateral Pledged |
122,878 |
100,076 |
|
Collateralized Loan Obligation [Member]
|
|
|
| Financial Instruments Owned and Pledged as Collateral [Line Items] |
|
|
| Outstanding Repurchase Agreements |
8,500 |
7,950 |
| Fair Value of Collateral Pledged |
14,789 |
12,945 |
| Amortized Cost Of Collateral Pledged |
$ 8,947 |
$ 6,877 |