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Note 5 - Securities (Details) - Securities Reconcilliation - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Available-for-sale securities:    
Available-for-sale securities, amortized costs $ 159,243 $ 184,397
Available-for-sale securities, gross unrealized gains 2,396 3,231
Available-for-sale securities, gross unrealized losses (876) (642)
Available-for-sale securities, estimated fair value 160,763 186,986
Held-to-maturity securities:    
Held-to-maturity securities, amortized costs 36,655 36,806
Held-to-maturity securities, estimated fair value 36,430  
US Government Agencies Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 5,229 6,351
Available-for-sale securities, gross unrealized gains 88 58
Available-for-sale securities, gross unrealized losses (3) (16)
Available-for-sale securities, estimated fair value 5,314 6,393
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 49,883 52,629
Available-for-sale securities, gross unrealized gains 1,541 1,788
Available-for-sale securities, gross unrealized losses (100) (54)
Available-for-sale securities, estimated fair value 51,324 54,363
Held-to-maturity securities:    
Held-to-maturity securities, amortized costs 36,655 36,806
Held-to-maturity securities, gross unrealized gains 538 712
Held-to-maturity securities, gross unrealized losses (763) (400)
Held-to-maturity securities, estimated fair value 36,430 37,118
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 37,745 46,727
Available-for-sale securities, gross unrealized gains 285 457
Available-for-sale securities, gross unrealized losses (254) (169)
Available-for-sale securities, estimated fair value 37,776 47,015
Corporate Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 33,380 37,392
Available-for-sale securities, gross unrealized gains 309 475
Available-for-sale securities, gross unrealized losses (188) (133)
Available-for-sale securities, estimated fair value 33,501 37,734
Commercial Mortgage Backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 9,558 10,402
Available-for-sale securities, gross unrealized gains 34 60
Available-for-sale securities, gross unrealized losses (125) (73)
Available-for-sale securities, estimated fair value 9,467 10,389
Asset-backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, amortized costs 23,448 30,896
Available-for-sale securities, gross unrealized gains 139 393
Available-for-sale securities, gross unrealized losses (206) (197)
Available-for-sale securities, estimated fair value $ 23,381 $ 31,092