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Note 2 - Investments (Detail) - Securities with Unrealized Losses not Recognized in Income (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value $ 22,820 $ 47,755
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses (73) (146)
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 1,048 887
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses (4) (4)
Available for Sale Securities with Unrealized Losses, Fair Value 23,868 48,642
Available for Sale Securities with Unrealized Losses, Unrealized Losses (77) (150)
US Government Agencies Debt Securities [Member]
   
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value 0 17,974
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses 0 (25)
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 0 0
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses 0 0
Available for Sale Securities with Unrealized Losses, Fair Value 0 17,974
Available for Sale Securities with Unrealized Losses, Unrealized Losses 0 (25)
US States and Political Subdivisions Debt Securities [Member]
   
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value 3,553 5,987
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses (14) (23)
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 1,048 0
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses (4) 0
Available for Sale Securities with Unrealized Losses, Fair Value 4,601 5,987
Available for Sale Securities with Unrealized Losses, Unrealized Losses (18) (23)
Mortgage-backed Securities, Issued by Private Enterprises [Member]
   
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value 572 18,091
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses (2) (87)
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 0 0
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses 0 0
Available for Sale Securities with Unrealized Losses, Fair Value 572 18,091
Available for Sale Securities with Unrealized Losses, Unrealized Losses (2) (87)
Collateralized Mortgage Obligations [Member]
   
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value 18,695 5,703
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses (57) (11)
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 0 887
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses 0 (4)
Available for Sale Securities with Unrealized Losses, Fair Value 18,695 6,590
Available for Sale Securities with Unrealized Losses, Unrealized Losses $ (57) $ (15)