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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Debt Securities [Member]    
$ 244,529,000  
247,147,000  
Amortized Cost 3,000  
Fair Value 3,000  
Due in one year or less 2,543,000  
Due in one year or less 2,550,000  
Due in one year or less 0  
Due in one year or less 0  
Due after one year through five years 76,637,000  
Due after one year through five years 76,854,000  
Due after one year through five years 0  
Due after one year through five years 0  
Due after five years through ten years 17,579,000  
Due after five years through ten years 17,855,000  
Due after five years through ten years  
Due after five years through ten years  
Due after ten years 32,216,000  
Due after ten years 33,611,000  
Due after ten years 0  
Due after ten years 0  
128,975,000  
130,870,000  
0  
0  
Mortgage-backed securities and CMO 115,554,000  
Mortgage-backed securities and CMO 116,277,000  
Mortgage-backed securities and CMO 3,000  
Mortgage-backed securities and CMO 3,000  
Amortized Cost 3,000 $ 4,000
Fair Value $ 3,000 $ 4,000