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	Jun. 30, 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	$ 12,302
Due in one year or less	12,128
Due after one year through five years	199,396
Due after one year through five years	198,404
Due after five years through ten years	94,352
Due after five years through ten years	94,984
Due after ten years	31,568
Due after ten years	32,148
Equity securities	6,659
Equity securities	5,909
Total investment securities available-for-sale	344,277	388,670
Total investment securities available-for-sale	$ 343,573	$ 393,840