Note 8 - Accumulated Other Comprehensive Income (Details) - Tax Effects Allocated to Each Component (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Note 8 - Accumulated Other Comprehensive Income (Details) - Tax Effects Allocated to Each Component [Line Items]
Before Tax Amount	$ (6,491)	$ 659	$ (7,030)	$ 746
Tax Expense (Benefit)	(2,355)	238	(2,548)	269
Net of Tax Amount	(4,136)	421	(4,482)	477
Change in Accumulated Gain (Loss) on Effective Cash Flow Derivatives [Member]
Note 8 - Accumulated Other Comprehensive Income (Details) - Tax Effects Allocated to Each Component [Line Items]
Before Tax Amount	210	(15)	361	53
Tax Expense (Benefit)	75	(6)	130	19
Net of Tax Amount	135	(9)	231	34
Securities With OTTI Charges During the Period [Member]
Note 8 - Accumulated Other Comprehensive Income (Details) - Tax Effects Allocated to Each Component [Line Items]
Before Tax Amount	(53)	(48)	(93)	(87)
Tax Expense (Benefit)	(19)	(17)	(34)	(31)
Net of Tax Amount	(34)	(31)	(59)	(56)
OTTI Charges Recognized in Net Income [Member]
Note 8 - Accumulated Other Comprehensive Income (Details) - Tax Effects Allocated to Each Component [Line Items]
Before Tax Amount	(39)	(38)	(66)	(77)
Tax Expense (Benefit)	(15)	(13)	(25)	(27)
Net of Tax Amount	(24)	(25)	(41)	(50)
Net Unrealized Losses On Investment Securities With OTTI [Member]
Note 8 - Accumulated Other Comprehensive Income (Details) - Tax Effects Allocated to Each Component [Line Items]
Before Tax Amount	(14)	(10)	(27)	(10)
Tax Expense (Benefit)	(4)	(4)	(9)	(4)
Net of Tax Amount	(10)	(6)	(18)	(6)
Unrealized Holding Gain Arising During the Period [Member]
Note 8 - Accumulated Other Comprehensive Income (Details) - Tax Effects Allocated to Each Component [Line Items]
Before Tax Amount	(6,664)	756	(7,327)	787
Tax Expense (Benefit)	(2,418)	274	(2,656)	284
Net of Tax Amount	(4,246)	482	(4,671)	503
Reclassification Adjustment for Gain (Loss) Included in Net Income [Member]
Note 8 - Accumulated Other Comprehensive Income (Details) - Tax Effects Allocated to Each Component [Line Items]
Before Tax Amount	23	72	37	84
Tax Expense (Benefit)	8	26	13	30
Net of Tax Amount	15	46	24	54
Net Unrealized Gains on Investment Securities [Member]
Note 8 - Accumulated Other Comprehensive Income (Details) - Tax Effects Allocated to Each Component [Line Items]
Before Tax Amount	(6,687)	684	(7,364)	703
Tax Expense (Benefit)	(2,426)	248	(2,669)	254
Net of Tax Amount	$ (4,261)	$ 436	$ (4,695)	$ 449