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Note 4 - Securities (Details) - Securities Reconcilliation - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale securities:    
Available-for-sale securities, amortized costs $ 172,538 $ 157,432
Available-for-sale securities, gross unrealized gains 2,616 2,346
Available-for-sale securities, gross unrealized losses (903) (748)
Available-for-sale securities, estimated fair value 174,251 159,030
Held-to-maturity securities:    
Held-to-maturity securities, amortized costs 35,357 35,899
Held-to-maturity securities, estimated fair value 36,454  
US Government Agencies Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 3,841 3,886
Available-for-sale securities, gross unrealized gains 74 57
Available-for-sale securities, estimated fair value 3,915 3,943
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 59,315 59,332
Available-for-sale securities, gross unrealized gains 1,998 1,811
Available-for-sale securities, gross unrealized losses (25) (39)
Available-for-sale securities, estimated fair value 61,288 61,104
Held-to-maturity securities:    
Held-to-maturity securities, amortized costs 35,357 35,899
Held-to-maturity securities, gross unrealized gains 1,206 966
Held-to-maturity securities, gross unrealized losses (109) (220)
Held-to-maturity securities, estimated fair value 36,454 36,645
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 51,830 32,215
Available-for-sale securities, gross unrealized gains 229 192
Available-for-sale securities, gross unrealized losses (338) (270)
Available-for-sale securities, estimated fair value 51,721 32,137
Corporate Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 23,841 33,775
Available-for-sale securities, gross unrealized gains 210 194
Available-for-sale securities, gross unrealized losses (287) (191)
Available-for-sale securities, estimated fair value 23,764 33,778
Commercial Mortgage Backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 14,690 12,893
Available-for-sale securities, gross unrealized gains 11 10
Available-for-sale securities, gross unrealized losses (130) (134)
Available-for-sale securities, estimated fair value 14,571 12,769
Asset-backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 19,021 15,331
Available-for-sale securities, gross unrealized gains 94 82
Available-for-sale securities, gross unrealized losses (123) (114)
Available-for-sale securities, estimated fair value $ 18,992 $ 15,299