Note 4 - Investment Securities (Details) - Amortized Cost and Estimated Fair Value of Securities Held-to-Maturity by Contractual Maturityaturity a (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amortized Cost and Estimated Fair Value of Securities Held-to-Maturity by Contractual Maturityaturity a [Abstract]
Due after one year through five years	$ 162
Due after one year through five years	146
Total investment securities held-to-maturity	162	166
Total investment securities held-to-maturity	$ 146	$ 146