Note 9 - Financing Arrangements, Portfolio Investments (Tables)

9 Months Ended

Sep. 30, 2014

Disclosure Text Block [Abstract]

Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

	September 30, 2014						December 31, 2013
	Outstanding Repurchase Agreements		Fair Value of Collateral Pledged		Amortized Cost Of Collateral Pledged		Outstanding Repurchase Agreements		Fair Value of Collateral Pledged		Amortized Cost Of Collateral Pledged
Agency RMBS
Agency ARMs	$	152,735	$	163,112	$	165,517	$	197,974	$	208,703	$	214,039
Agency Fixed Rate		393,141		419,560		433,849		489,953		516,010		541,580
Agency IOs		82,005		101,242		111,540		94,698		113,721		122,878
CLOs		—		—		—		8,500		14,789		8,947
Balance at end of the period	$	627,881	$	683,914	$	710,906	$	791,125	$	853,223	$	887,444

Outstanding Repurchase Agreements by Contractual Maturity [Table Text Block]

Contractual Maturity	September 30, 2014		December 31, 2013
Within 30 days	$	379,951	$	509,564
Over 30 days to 90 days		181,544		281,561
Over 90 days		66,386		—
Total	$	627,881	$	791,125