Note 5 - Securities (Details) - Temporarily Impaired Securities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	$ 12,403	$ 202,015
Less Than 12 Months - Unrealized Loss	129	27,059
12 Months or More - Fair Value	199,626	18,493
12 Months or More - Unrealized Loss	16,218	3,702
US Government Agencies [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	4,996	138,324
Less Than 12 Months - Unrealized Loss	13	20,400
12 Months or More - Fair Value	161,705	15,796
12 Months or More - Unrealized Loss	14,036	3,211
States And Political Subdivisions [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	4,866	58,013
Less Than 12 Months - Unrealized Loss	25	6,131
12 Months or More - Fair Value	34,076	2,697
12 Months or More - Unrealized Loss	2,000	491
Corporate Securities [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	2,424	5,511
Less Than 12 Months - Unrealized Loss	19	506
12 Months or More - Fair Value	3,845
12 Months or More - Unrealized Loss	182
Other Securities [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	117	167
Less Than 12 Months - Unrealized Loss	$ 72	$ 22