Note 5 - Securities (Details) - Held to Maturity Securities (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Held to Maturity:
Amortized Costs	$ 164,752	$ 160,539
Gross Unrealized Gains	3,528	10,523
Gross Unrealized Losses	7,604	216
Fair Values	160,676	170,846
US Government Agencies [Member]
Held to Maturity:
Amortized Costs	13,977	7,988
Gross Unrealized Gains	315	563
Gross Unrealized Losses	1,025
Fair Values	13,267	8,551
Mortgage-backed Securities [Member]
Held to Maturity:
Amortized Costs	547	691
Gross Unrealized Gains	55	73
Fair Values	602	764
States and Political Subdivisions [Member]
Held to Maturity:
Amortized Costs	150,228	151,209
Gross Unrealized Gains	3,158	9,880
Gross Unrealized Losses	6,579	216
Fair Values	146,807	160,873
Corporate Securities [Member]
Held to Maturity:
Amortized Costs		651
Gross Unrealized Gains		7
Fair Values		$ 658