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Note 4 - Securities (Details) - Securities Reconcilliation - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale securities:    
Available-for-sale securities, amortized costs $ 157,432 $ 184,397
Available-for-sale securities, gross unrealized gains 2,346 3,231
Available-for-sale securities, gross unrealized losses (748) (642)
Available-for-sale securities, estimated fair value 159,030 186,986
Held-to-maturity securities:    
Held-to-maturity securities, amortized costs 35,899 36,806
Held-to-maturity securities, estimated fair value 36,645  
US Government Agencies Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 3,886 6,351
Available-for-sale securities, gross unrealized gains 57 58
Available-for-sale securities, gross unrealized losses   (16)
Available-for-sale securities, estimated fair value 3,943 6,393
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 59,332 52,629
Available-for-sale securities, gross unrealized gains 1,811 1,788
Available-for-sale securities, gross unrealized losses (39) (54)
Available-for-sale securities, estimated fair value 61,104 54,363
Held-to-maturity securities:    
Held-to-maturity securities, amortized costs 35,899 36,806
Held-to-maturity securities, gross unrealized gains 966 712
Held-to-maturity securities, gross unrealized losses (220) (400)
Held-to-maturity securities, estimated fair value 36,645 37,118
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 32,215 46,727
Available-for-sale securities, gross unrealized gains 192 457
Available-for-sale securities, gross unrealized losses (270) (169)
Available-for-sale securities, estimated fair value 32,137 47,015
Corporate Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 33,775 37,392
Available-for-sale securities, gross unrealized gains 194 475
Available-for-sale securities, gross unrealized losses (191) (133)
Available-for-sale securities, estimated fair value 33,778 37,734
Commercial Mortgage Backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 12,893 10,402
Available-for-sale securities, gross unrealized gains 10 60
Available-for-sale securities, gross unrealized losses (134) (73)
Available-for-sale securities, estimated fair value 12,769 10,389
Asset-backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 15,331 30,896
Available-for-sale securities, gross unrealized gains 82 393
Available-for-sale securities, gross unrealized losses (114) (197)
Available-for-sale securities, estimated fair value $ 15,299 $ 31,092