Note 7 - Investment Securities (Detail) - Maturities of Investment Securities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale:
Due in one year or less	$ 855
Due in one year or less	867
Due after one year through five years	21,639
Due after one year through five years	22,476
Due after five years through ten years	29,268
Due after five years through ten years	30,870
Due after ten years	10,517
Due after ten years	11,005
	62,279
	65,218
	210,966	242,438
	215,881	251,747
Held-to-maturity:
Due in one year or less	2,656
Due in one year or less	2,670
Due after one year through five years	3,231
Due after one year through five years	3,293
Due after five years through ten years	1,756
Due after five years through ten years	1,771
	7,643
	7,734
Residential Mortgage Backed Securities [Member]
Available-for-sale:
Adjusted Carrying Value	51,448
Fair Value	52,417
	210,966
	215,881
Collateralized Mortgage Obligations [Member]
Available-for-sale:
Adjusted Carrying Value	94,039
Fair Value	95,046
	94,039	76,480
	95,046	78,242
Mutual Funds [Member]
Available-for-sale:
Adjusted Carrying Value	3,200
Fair Value	3,200
	3,200
	$ 3,200