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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortized cost, due within 5 years $ 10,000
Amortized cost, due after 5 years through 10 years 16,700 6,132
Amortized cost, due after 10 years 9,130 8,492
Amortized cost, total 25,830 24,624
Fair value, due within 5 years 9,987
Fair value, due after 5 years through 10 years 16,583 6,106
Fair value, due after 10 years 8,993 8,335
Fair value, total 25,576 24,428
Corporate Debt Securities [Member]    
Amortized cost, due within 5 years 9,000
Amortized cost, due after 5 years through 10 years 9,000
Amortized cost, due after 10 years 5,000
Amortized cost, total 14,000 9,000
Fair value, due within 5 years 8,961
Fair value, due after 5 years through 10 years 8,928
Fair value, due after 10 years 4,876
Fair value, total 13,804 8,961
Subordinated Notes [Member]    
Amortized cost, due within 5 years 1,000
Amortized cost, due after 5 years through 10 years 4,500 4,000
Amortized cost, due after 10 years
Amortized cost, total 4,500 5,000
Fair value, due within 5 years 1,026
Fair value, due after 5 years through 10 years 4,548 4,000
Fair value, due after 10 years
Fair value, total 4,548 5,026
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 13,500 4,000
Amortized cost, due after 10 years 5,000
Amortized cost, total 18,500 14,000
Fair value, due within 5 years 9,987
Fair value, due after 5 years through 10 years 13,476 4,000
Fair value, due after 10 years 4,876
Fair value, total 18,352 13,987
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 3,200 2,132
Amortized cost, due after 10 years 4,130 8,492
Amortized cost, total 7,330 10,624
Fair value, due within 5 years
Fair value, due after 5 years through 10 years 3,107 2,106
Fair value, due after 10 years 4,117 8,335
Fair value, total $ 7,224 $ 10,441