Note 6 - Debt and Equity Securities (Detail) - Available for sale securities with gross unrealized losses and their fair value: (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value	$ 89,303	$ 62,902
Unrealized Losses	7,772	15,490
Fair Value, Less than 12 months	60,764	32,537
Unrealized Losses, Less than 12 months	320	311
Fair Value, 12 months or more	28,539	30,365
Unrealized Losses, 12 months or more	7,452	15,179
Municipal [Member]
Fair Value	9,782
Unrealized Losses	83
Fair Value, Less than 12 months	9,782
Unrealized Losses, Less than 12 months	83
Other Debt Obligations [Member]
Fair Value	5,064	6,238
Unrealized Losses	4,499	5,324
Fair Value, Less than 12 months		1,997
Unrealized Losses, Less than 12 months		2
Fair Value, 12 months or more	5,064	4,241
Unrealized Losses, 12 months or more	4,499	5,322
Available For Sale Securities, Excluding Mortgage-Backed Securities [Member]
Fair Value	14,846	24,218
Unrealized Losses	4,582	5,509
Fair Value, Less than 12 months	9,782	19,977
Unrealized Losses, Less than 12 months	83	187
Fair Value, 12 months or more	5,064	4,241
Unrealized Losses, 12 months or more	4,499	5,322
REMIC And CMO [Member]
Fair Value	64,126	38,684
Unrealized Losses	3,108	9,981
Fair Value, Less than 12 months	40,651	12,560
Unrealized Losses, Less than 12 months	155	124
Fair Value, 12 months or more	23,475	26,124
Unrealized Losses, 12 months or more	2,953	9,857
FNMA [Member]
Fair Value	10,331
Unrealized Losses	82
Fair Value, Less than 12 months	10,331
Unrealized Losses, Less than 12 months	82
Collateralized Mortgage Backed Securities [Member]
Fair Value	74,457
Unrealized Losses	3,190
Fair Value, Less than 12 months	50,982
Unrealized Losses, Less than 12 months	237
Fair Value, 12 months or more	23,475
Unrealized Losses, 12 months or more	2,953
Corporate Debt Securities [Member]
Fair Value		17,980
Unrealized Losses		185
Fair Value, Less than 12 months		17,980
Unrealized Losses, Less than 12 months		$ 185