Note 7 - Investment Securities (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Note 7 - Investment Securities (Details) [Line Items]
Available-for-sale Securities, Gross Unrealized Loss	$ 9,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	1,837,000	856,000
Available-for-sale Securities	586,053,000	573,108,000
AFS Gross Unrealized Losses [Member]
Note 7 - Investment Securities (Details) [Line Items]
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	(7,600,000)
Corporate Debt Securities [Member]
Note 7 - Investment Securities (Details) [Line Items]
Available-for-sale Securities, Gross Unrealized Loss	987,000	856,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	985,000	856,000
Available-for-sale Securities	5,776,000	5,826,000
Residential Mortgage Backed Securities [Member]
Note 7 - Investment Securities (Details) [Line Items]
Available-for-sale Securities, Gross Unrealized Loss	3,468,000	256,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	574,000	0
Available-for-sale Securities	351,749,000	370,439,000
Single Issuer Corporate Debt Security [Member]
Note 7 - Investment Securities (Details) [Line Items]
Available-for-sale Securities	$ 4,900,000