Note 5 - Securities (Details) - Available for Sale Securities (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Available for Sale:
Amortized Costs	$ 217,370	$ 186,667
Gross Unrealized Gains	1,693	3,946
Gross Unrealized Losses	13,115	798
Fair Values	205,948	189,815
US Treasury Securities [Member]
Available for Sale:
Amortized Costs	2,002	2,005
Gross Unrealized Gains	30	68
Gross Unrealized Losses	0	0
Fair Values	2,032	2,073
US Government Agencies [Member]
Available for Sale:
Amortized Costs	173,812	128,805
Gross Unrealized Gains	355	1,381
Gross Unrealized Losses	12,381	622
Fair Values	161,786	129,564
Mortgage-backed Securities [Member]
Available for Sale:
Amortized Costs	3,324	4,202
Gross Unrealized Gains	257	367
Gross Unrealized Losses	0	0
Fair Values	3,581	4,569
States and Political Subdivisions [Member]
Available for Sale:
Amortized Costs	27,080	35,029
Gross Unrealized Gains	906	1,753
Gross Unrealized Losses	99	3
Fair Values	27,887	36,779
Corporate Securities [Member]
Available for Sale:
Amortized Costs	8,807	14,207
Gross Unrealized Gains	135	368
Gross Unrealized Losses	504	0
Fair Values	8,438	14,575
Other Securities [Member]
Available for Sale:
Amortized Costs	2,345	2,419
Gross Unrealized Gains	10	9
Gross Unrealized Losses	131	173
Fair Values	$ 2,224	$ 2,255