Note 5 - Real Estate Owned (REO) (Details) - REO, Held as Investment, by Geographic Area (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
San Francisco Bay Area(1)
Net book value	$ 6,182		$ 66,754		$ 162,563
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | Alameda [Member]
San Francisco Bay Area(1)
Number of properties	2	[1]	2	[1]
Net book value	7,418	[1]	2,786	[1]
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | Contra Costa [Member]
San Francisco Bay Area(1)
Number of properties	2	[1]	1	[1]
Net book value	3,686	[1]	928	[1]
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | San Francisco [Member]
San Francisco Bay Area(1)
Number of properties		[1]		[1]
Net book value		[1]		[1]
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | Solano [Member]
San Francisco Bay Area(1)
Number of properties	1	[1]	1	[1]
Net book value	932	[1]	962	[1]
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | San Francisco Bay Area [Member]
San Francisco Bay Area(1)
Number of properties	5	[1]	4	[1]
Net book value	12,036	[1]	4,676	[1]
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | Sacramento [Member]
San Francisco Bay Area(1)
Number of properties	1
Net book value	39,744
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | Other Northern California [Member]
San Francisco Bay Area(1)
Number of properties	1
Net book value	39,744
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | Northern California [Member]
San Francisco Bay Area(1)
Number of properties	6		4
Net book value	51,780		4,676
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | Los Angeles [Member]
San Francisco Bay Area(1)
Number of properties	2		2
Net book value	70,706		70,665
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | Southern California [Member]
San Francisco Bay Area(1)
Number of properties			2
Net book value			70,665
Rental Properties Held as Investment [Member] | REO Held for Sale [Member] | CALIFORNIA
San Francisco Bay Area(1)
Number of properties	8		6
Net book value	122,486		75,341
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | Alameda [Member]
San Francisco Bay Area(1)
Number of properties		[1]	1	[1]
Net book value		[1]	4,766	[1]
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | Contra Costa [Member]
San Francisco Bay Area(1)
Number of properties	1	[1]	2	[1]
Net book value	1,019	[1]	4,103	[1]
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | San Francisco [Member]
San Francisco Bay Area(1)
Number of properties	2	[1]	2	[1]
Net book value	2,847	[1]	2,857	[1]
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | San Francisco Bay Area [Member]
San Francisco Bay Area(1)
Number of properties	3	[1]	5	[1]
Net book value	3,866	[1]	11,726	[1]
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | Sacramento [Member]
San Francisco Bay Area(1)
Number of properties			1
Net book value			38,719
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | Other Northern California [Member]
San Francisco Bay Area(1)
Number of properties	1		2
Net book value	1,441		40,246
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | Northern California [Member]
San Francisco Bay Area(1)
Number of properties	4		7
Net book value	5,307		51,972
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | CALIFORNIA
San Francisco Bay Area(1)
Number of properties	4		7
Net book value	5,307		51,972
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | Marin [Member]
San Francisco Bay Area(1)
Number of properties		[1]		[1]
Net book value		[1]		[1]
Rental Properties Held as Investment [Member] | REO Held as Investment [Member] | Amador [Member]
San Francisco Bay Area(1)
Number of properties	1		1
Net book value	1,441		1,527
Rental Properties Held as Investment [Member]
San Francisco Bay Area(1)
Number of properties	4		7
Net book value	5,307		51,972
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Alameda [Member]
San Francisco Bay Area(1)
Number of properties		[1]
Net book value		[1]
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Contra Costa [Member]
San Francisco Bay Area(1)
Number of properties		[1]
Net book value		[1]
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | San Francisco [Member]
San Francisco Bay Area(1)
Number of properties	2	[1]	2
Net book value	4,205	[1]	4,624
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Solano [Member]
San Francisco Bay Area(1)
Number of properties		[1]
Net book value		[1]
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | San Francisco Bay Area [Member]
San Francisco Bay Area(1)
Number of properties	2	[1]	2	[1]
Net book value	4,205	[1]	4,624	[1]
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Stanislaus County [Member]
San Francisco Bay Area(1)
Number of properties	1
Net book value	2,782
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Fresno County,California [Member]
San Francisco Bay Area(1)
Number of properties	1
Net book value	861
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Other Northern California [Member]
San Francisco Bay Area(1)
Number of properties	2
Net book value	3,643
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Northern California [Member]
San Francisco Bay Area(1)
Number of properties	4		2
Net book value	7,848		4,624
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Orange County [Member]
San Francisco Bay Area(1)
Number of properties			1
Net book value			393
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Los Angeles [Member]
San Francisco Bay Area(1)
Number of properties	1
Net book value	10,459
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | Southern California [Member]
San Francisco Bay Area(1)
Number of properties			1
Net book value			393
Non-Rental Held as Investment [Member] | REO Held for Sale [Member] | CALIFORNIA
San Francisco Bay Area(1)
Number of properties	5		3
Net book value	18,307		5,017
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | Alameda [Member]
San Francisco Bay Area(1)
Number of properties		[1]		[1]
Net book value		[1]		[1]
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | Contra Costa [Member]
San Francisco Bay Area(1)
Number of properties		[1]		[1]
Net book value		[1]		[1]
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | San Francisco [Member]
San Francisco Bay Area(1)
Number of properties		[1]		[1]
Net book value		[1]		[1]
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | San Francisco Bay Area [Member]
San Francisco Bay Area(1)
Number of properties		[1]	1	[1]
Net book value	875	[1]	1,010	[1]
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | Stanislaus County [Member]
San Francisco Bay Area(1)
Number of properties			1
Net book value			2,780
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | Fresno County,California [Member]
San Francisco Bay Area(1)
Number of properties			1
Net book value			865
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | Other Northern California [Member]
San Francisco Bay Area(1)
Number of properties			2
Net book value			3,645
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | Northern California [Member]
San Francisco Bay Area(1)
Number of properties	1		3
Net book value	875		4,655
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | Los Angeles [Member]
San Francisco Bay Area(1)
Number of properties			1
Net book value			10,127
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | CALIFORNIA
San Francisco Bay Area(1)
Number of properties	1		4
Net book value	875		14,782
Non-Rental Held as Investment [Member] | REO Held as Investment [Member] | Marin [Member]
San Francisco Bay Area(1)
Number of properties	1	[1]	1	[1]
Net book value	875	[1]	1,010	[1]
Non-Rental Held as Investment [Member]
San Francisco Bay Area(1)
Number of properties	1		3
Net book value	$ 875		$ 4,655
REO Held as Investment [Member]
San Francisco Bay Area(1)
Number of properties	4

[1] Includes Silicon Valley