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Note 3 - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Debt Securities [Member]    
$ 208,596,000  
210,415,000  
4,000  
4,000  
Due in one year or less 1,948,000  
Due in one year or less 1,959,000  
Due in one year or less 0  
Due in one year or less 0  
Due after one year through five years 75,360,000  
Due after one year through five years 75,502,000  
Due after one year through five years 0  
Due after one year through five years 0  
Due after five years through ten years 24,823,000  
Due after five years through ten years $ 25,251,000  
Due after five years through ten years  
Due after five years through ten years  
Due after ten years $ 29,531,000  
Due after ten years 30,602,000  
Due after ten years 0  
Due after ten years 0  
131,662,000  
133,314,000  
0  
0  
Mortgage-backed securities and CMO 76,934,000  
Mortgage-backed securities and CMO 77,101,000  
Mortgage-backed securities and CMO 4,000  
Mortgage-backed securities and CMO 4,000  
4,000 $ 4,000
$ 4,000 $ 4,000