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Note 3 - Investment Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Note 3 - Investment Securities (Details) [Line Items]    
Available-for-sale Securities Pledged as Collateral $ 315,000 $ 294,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 3,232 3,004
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 1,833 2,750
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Percent 56.70%  
Available-for-sale Securities $ 582,202 626,388
AFS Gross Unrealized Losses [Member]    
Note 3 - Investment Securities (Details) [Line Items]    
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes 228  
Corporate Debt Securities [Member]    
Note 3 - Investment Securities (Details) [Line Items]    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 800 358
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 794 354
Available-for-sale Securities 5,840 6,307
Collateralized Mortgage Backed Securities [Member]    
Note 3 - Investment Securities (Details) [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 638  
Single Issuer Corporate Debt Security [Member]    
Note 3 - Investment Securities (Details) [Line Items]    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 793 $ 354
Available-for-sale Securities $ 5,100