Note 2 - Securities (Detail) - Securities in an unrealized loss position (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Less Than 12 Months - Fair Value	$ 22,261	$ 11,283
Less Than 12 Months - Unrealized Loss	224	74
12 Months or More - Fair Value	787	263
12 Months or More - Unrealized Loss	5	2
Total - Fair Value	23,048	11,546
Total - Unrealized Loss	229	76
US Government Agencies and Corporations (Member)
Less Than 12 Months - Fair Value	17,033	5,479
Less Than 12 Months - Unrealized Loss	118	3
Total - Fair Value	17,033	5,479
Total - Unrealized Loss	118	3
Obligations of States and Political Subdivisions (Member)
Less Than 12 Months - Fair Value	5,228	5,804
Less Than 12 Months - Unrealized Loss	106	71
12 Months or More - Fair Value	787	263
12 Months or More - Unrealized Loss	5	2
Total - Fair Value	6,015	6,067
Total - Unrealized Loss	$ 111	$ 73