Note 5 - Securities (Details) - Temporarily Impaired Securities (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	$ 17,782	$ 202,015
Less Than 12 Months - Unrealized Loss	137	27,059
12 Months or More - Fair Value	192,173	18,493
12 Months or More - Unrealized Loss	12,647	3,702
US Government Agencies [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	16,798	138,324
Less Than 12 Months - Unrealized Loss	79	20,400
12 Months or More - Fair Value	161,479	15,796
12 Months or More - Unrealized Loss	11,260	3,211
States And Political Subdivisions [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	401	58,013
Less Than 12 Months - Unrealized Loss		6,131
12 Months or More - Fair Value	26,841	2,697
12 Months or More - Unrealized Loss	1,212	491
Corporate Securities [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	450	5,511
Less Than 12 Months - Unrealized Loss	2	506
12 Months or More - Fair Value	3,853
12 Months or More - Unrealized Loss	175
Other Securities [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	133	167
Less Than 12 Months - Unrealized Loss	$ 56	$ 22