Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Amortized Cost and Estimated Fair Value of Securities Available-for-Sale by Contractual Maturity [Abstract]
Due in one year or less	$ 9,383
Due in one year or less	9,249
Due after one year through five years	198,407
Due after one year through five years	198,220
Due after five years through ten years	111,505
Due after five years through ten years	113,870
Due after ten years	33,414
Due after ten years	34,592
Equity securities	6,743
Equity securities	6,016
Total investment securities available-for-sale	359,452	388,670
Total investment securities available-for-sale	$ 361,947	$ 393,840