Note 3 - Securities (Details) - Credit-Related CDO Impairment Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		66 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013
Note 3 - Securities (Details) - Credit-Related CDO Impairment Losses [Line Items]
Credit-Related CDO Impairment Losses	$ 0	$ 1,405	$ 0	$ 2,126	$ 31,915
No 1 [Member]
Note 3 - Securities (Details) - Credit-Related CDO Impairment Losses [Line Items]
Credit-Related CDO Impairment Losses	0	0	0	0	10,360
No 2 [Member]
Note 3 - Securities (Details) - Credit-Related CDO Impairment Losses [Line Items]
Credit-Related CDO Impairment Losses	0	893	0	1,535	9,402
No 3 [Member]
Note 3 - Securities (Details) - Credit-Related CDO Impairment Losses [Line Items]
Credit-Related CDO Impairment Losses	0	512	0	591	2,262
No 4 [Member]
Note 3 - Securities (Details) - Credit-Related CDO Impairment Losses [Line Items]
Credit-Related CDO Impairment Losses	0	0	0	0	1,078
No 5 [Member]
Note 3 - Securities (Details) - Credit-Related CDO Impairment Losses [Line Items]
Credit-Related CDO Impairment Losses	0	0	0	0	8,570
No 6 [Member]
Note 3 - Securities (Details) - Credit-Related CDO Impairment Losses [Line Items]
Credit-Related CDO Impairment Losses	$ 0	$ 0	$ 0	$ 0	$ 243