Note 5 - Securities (Details) - Temporarily Impaired Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	$ 177,790	$ 202,015
Less Than 12 Months - Unrealized Loss	17,115	27,059
12 Months or More - Fair Value	43,045	18,493
12 Months or More - Unrealized Loss	5,924	3,702
US Government Agencies [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	144,919	138,324
Less Than 12 Months - Unrealized Loss	15,556	20,400
12 Months or More - Fair Value	20,880	15,796
12 Months or More - Unrealized Loss	3,327	3,211
States and Political Subdivisions [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	24,639	58,013
Less Than 12 Months - Unrealized Loss	1,178	6,131
12 Months or More - Fair Value	22,165	2,697
12 Months or More - Unrealized Loss	2,597	491
Corporate Securities [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	8,094	5,511
Less Than 12 Months - Unrealized Loss	330	506
Other Securities [Member]
Note 5 - Securities (Details) - Temporarily Impaired Securities [Line Items]
Less Than 12 Months - Fair Value	138	167
Less Than 12 Months - Unrealized Loss	$ 51	$ 22