Note 6 - Investment Securities (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Note 6 - Investment Securities (Details) [Line Items]
Available-for-sale Securities, Gross Unrealized Loss	$ 8,300,000	$ 12,900,000
Percentage Decrease in Securities With Gross Unrealized Losses	35.50%
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	2,774,000	3,609,000
Available-for-sale Securities	607,764,000	612,820,000
AFS Gross Unrealized Losses [Member]
Note 6 - Investment Securities (Details) [Line Items]
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	4,600,000
Single Issuer Corporate Debt Security [Member]
Note 6 - Investment Securities (Details) [Line Items]
Available-for-sale Securities, Gross Unrealized Loss	670,000
Available-for-sale Securities	$ 5,200,000