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Note 2 - Investments (Details) - Securities with Unrealized Losses not Recognized in Income (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Note 2 - Investments (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]    
Less than 12 Months, Fair Value $ 128,657 $ 47,271
Less than 12 Months, Unrealized Losses (2,374) (163)
12 Months or More, Fair Value 4,423 1,816
12 Months or More, Unrealized Losses (60) (7)
Fair Value 133,080 49,087
Unrealized Losses (2,434) (170)
US Government Agencies Debt Securities [Member]
    
Note 2 - Investments (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]    
Less than 12 Months, Fair Value 36,226 10,135
Less than 12 Months, Unrealized Losses (345) (15)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Fair Value 36,226 10,135
Unrealized Losses (345) (15)
US States and Political Subdivisions Debt Securities [Member]
    
Note 2 - Investments (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]    
Less than 12 Months, Fair Value 71,154 17,141
Less than 12 Months, Unrealized Losses (1,726) (93)
12 Months or More, Fair Value 3,861 582
12 Months or More, Unrealized Losses (58) (2)
Fair Value 75,015 17,723
Unrealized Losses (1,784) (95)
Mortgage-backed Securities, Issued by Private Enterprises [Member]
    
Note 2 - Investments (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]    
Less than 12 Months, Fair Value 17,242 0
Less than 12 Months, Unrealized Losses (264) 0
12 Months or More, Fair Value 0 513
12 Months or More, Unrealized Losses 0 (2)
Fair Value 17,242 513
Unrealized Losses (264) (2)
Collateralized Mortgage Obligations [Member]
    
Note 2 - Investments (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]    
Less than 12 Months, Fair Value 4,035 19,995
Less than 12 Months, Unrealized Losses (39) (55)
12 Months or More, Fair Value 562 721
12 Months or More, Unrealized Losses (2) (3)
Fair Value 4,597 20,716
Unrealized Losses $ (41) $ (58)