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Note 6 - Investment Securities Available For Sale (Details) - Gross Unrealized Losses and Fair Value (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Note 6 - Investment Securities Available For Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items]    
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value $ 78,393 $ 31,531
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses (5,673) (260)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value 6,167 0
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses (225) 0
Securities in Continuous Unrealized Loss Position Fair Value 84,560 31,531
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses (5,898) (260)
US Government Agencies Debt Securities [Member]
    
Note 6 - Investment Securities Available For Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items]    
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value 17,408 9,938
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses (1,368) (91)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value 0 0
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses 0 0
Securities in Continuous Unrealized Loss Position Fair Value 17,408 9,938
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses (1,368) (91)
US States and Political Subdivisions Debt Securities [Member]
    
Note 6 - Investment Securities Available For Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items]    
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value 30,690 9,240
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses (3,244) (104)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value 448 0
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses (40) 0
Securities in Continuous Unrealized Loss Position Fair Value 31,138 9,240
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses (3,284) (104)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
    
Note 6 - Investment Securities Available For Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items]    
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value 30,295 12,353
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses (1,061) (65)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value 5,719 0
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses (185) 0
Securities in Continuous Unrealized Loss Position Fair Value 36,014 12,353
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses $ (1,246) $ (65)