Note 2 - Securities (Details) - Securities with Unrealized Losses not Recognized in Income (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Note 2 - Securities (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	$ 113,490	$ 47,271
Less than 12 Months, Unrealized Losses	(2,013)	(163)
12 Months or More, Fair Value	11,344	1,816
12 Months or More, Unrealized Losses	(98)	(7)
Fair Value	124,834	49,087
Unrealized Losses	(2,111)	(170)
US Government Agencies Debt Securities [Member]
Note 2 - Securities (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	27,403	10,135
Less than 12 Months, Unrealized Losses	(224)	(15)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Fair Value	27,403	10,135
Unrealized Losses	(224)	(15)
US States and Political Subdivisions Debt Securities [Member]
Note 2 - Securities (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	68,508	17,141
Less than 12 Months, Unrealized Losses	(1,603)	(93)
12 Months or More, Fair Value	4,414	582
12 Months or More, Unrealized Losses	(53)	(2)
Fair Value	72,922	17,723
Unrealized Losses	(1,656)	(95)
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Note 2 - Securities (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	15,096	0
Less than 12 Months, Unrealized Losses	(173)	0
12 Months or More, Fair Value	0	513
12 Months or More, Unrealized Losses	0	(2)
Fair Value	15,096	513
Unrealized Losses	(173)	(2)
Collateralized Mortgage Obligations [Member]
Note 2 - Securities (Details) - Securities with Unrealized Losses not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	2,483	19,995
Less than 12 Months, Unrealized Losses	(13)	(55)
12 Months or More, Fair Value	6,930	721
12 Months or More, Unrealized Losses	(45)	(3)
Fair Value	9,413	20,716
Unrealized Losses	$ (58)	$ (58)