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Note 2 - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
U.S. Government agency mortgage-backed securities, amortized cost $ 11,436,000  
U.S. Government agency mortgage-backed securities, fair value 11,412,000  
Total, amortized cost 11,436,000 $ 13,625,000
Total, fair value 11,412,000 13,413,000
Due from one to five years 9,000,000  
Due from one to five years 8,937,000  
Due after five years 3,000,000  
Due after five years 3,025,000  
Total, amortized cost 23,436,000 29,625,000
Total, fair value $ 23,374,000 $ 29,377,000