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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Amortized cost, Due within 5 years $ 10,000
Amortized Cost, Due after 5 years through 10 years 6,132,000 18,905,000
Amortized Cost, Due after 10 years 8,492,000 10,720,000
Amortized Cost, Total 24,624,000 29,625,000
Fair value, Due within 5 years 9,987,000
Fair value, Due after 5 years through 10 years 6,106,000 18,827,000
Fair value, Due after 10 years 8,335,000 10,550,000
Available-for-sale securities 24,428,000 29,377,000
Corporate Debt Securities [Member]    
Amortized cost, Due within 5 years 9,000,000
Amortized Cost, Due after 5 years through 10 years 9,000,000
Amortized Cost, Due after 10 years
Amortized Cost, Total 9,000,000 9,000,000
Fair value, Due within 5 years 8,961,000
Fair value, Due after 5 years through 10 years 9,010,000
Fair value, Due after 10 years
Available-for-sale securities 8,961,000 9,010,000
Subordinated Notes [Member]    
Amortized cost, Due within 5 years 1,000,000
Amortized Cost, Due after 5 years through 10 years 4,000,000 2,000,000
Amortized Cost, Due after 10 years
Amortized Cost, Total 5,000,000 2,000,000
Fair value, Due within 5 years 1,026,000
Fair value, Due after 5 years through 10 years 4,000,000 2,000,000
Fair value, Due after 10 years
Available-for-sale securities 5,026,000 2,000,000
US Government Agencies Debt Securities [Member]    
Amortized cost, Due within 5 years  
Amortized Cost, Due after 5 years through 10 years   5,000,000
Amortized Cost, Due after 10 years  
Amortized Cost, Total   5,000,000
Fair value, Due within 5 years  
Fair value, Due after 5 years through 10 years   4,954,000
Fair value, Due after 10 years  
Available-for-sale securities   4,954,000
Available-for-sale Securities with Single Maturity Dates [Member]    
Amortized cost, Due within 5 years 10,000
Amortized Cost, Due after 5 years through 10 years 4,000,000 16,000,000
Amortized Cost, Due after 10 years
Amortized Cost, Total 14,000,000 16,000,000
Fair value, Due within 5 years 9,987
Fair value, Due after 5 years through 10 years 4,000,000 15,964,000
Fair value, Due after 10 years
Available-for-sale securities 13,987,000 15,964,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Amortized cost, Due within 5 years
Amortized Cost, Due after 5 years through 10 years 2,132,000 2,905,000
Amortized Cost, Due after 10 years 8,492,000 10,720,000
Amortized Cost, Total 10,624,000 13,625,000
Fair value, Due within 5 years
Fair value, Due after 5 years through 10 years 2,106,000 2,863,000
Fair value, Due after 10 years 8,335,000 10,550,000
Available-for-sale securities $ 10,441,000 $ 13,413,000