Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost and Estimated Fair Value of Securities Available for Sale (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost and Estimated Fair Value of Securities Available for Sale [Line Items]
Amortized Cost	$ 388,628	$ 383,665
Gross Unrealized Gains	5,136	4,003
Gross Unrealized Losses	5,974	9,535
Estimated Fair Value	387,790	378,133	318,431
US Government Agencies Debt Securities [Member]
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost and Estimated Fair Value of Securities Available for Sale [Line Items]
Amortized Cost	48,797	46,640
Gross Unrealized Gains	687	843
Gross Unrealized Losses	127	148
Estimated Fair Value	49,357	47,335
Residential Mortgage Backed Securities [Member]
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost and Estimated Fair Value of Securities Available for Sale [Line Items]
Amortized Cost	232,001	234,206
Gross Unrealized Gains	1,292	1,143
Gross Unrealized Losses	4,682	6,675
Estimated Fair Value	228,611	228,674
Municipal Bond [Member]
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost and Estimated Fair Value of Securities Available for Sale [Line Items]
Amortized Cost	107,434	102,423
Gross Unrealized Gains	3,136	2,017
Gross Unrealized Losses	1,165	2,700
Estimated Fair Value	109,405	101,740
Equity Investment Other [Member]
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost and Estimated Fair Value of Securities Available for Sale [Line Items]
Amortized Cost	396	396
Gross Unrealized Gains	21
Gross Unrealized Losses		12
Estimated Fair Value	$ 417	$ 384