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Note 2 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Amortized cost, due within 5 years $ 1,000 $ 10,000
Amortized cost, due after 5 years through 10 years 16,440 6,132
Amortized cost, due after 10 years 12,131 8,492
Amortized cost, total 29,571 24,624
Fair value, due within 5 years 1,019 9,987
Fair value, due after 5 years through 10 years 16,500 6,106
Fair value, due after 10 years 12,067 8,335
Fair value, total 29,586 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 8,954
Fair value, due after 10 years 4,951
Fair value, total 13,905 8,961
Subordinated Notes [Member]    
Amortized cost, due within 5 years 1,000 1,000
Amortized cost, due after 5 years through 10 years 6,500 4,000
Amortized cost, due after 10 years
Amortized cost, total 7,500 5,000
Fair value, due within 5 years 1,019 1,026
Fair value, due after 5 years through 10 years 6,626 4,000
Fair value, due after 10 years
Fair value, total 7,645 5,026
Available-for-sale Securities with Single Maturity Dates [Member]    
Amortized cost, due within 5 years 1,000 10,000
Amortized cost, due after 5 years through 10 years 15,500 4,000
Amortized cost, due after 10 years 5,000
Amortized cost, total 21,500 14,000
Fair value, due within 5 years 1,019 9,987
Fair value, due after 5 years through 10 years 15,580 4,000
Fair value, due after 10 years 4,951
Fair value, total 21,550 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 940 2,132
Amortized cost, due after 10 years 7,131 8,492
Amortized cost, total 8,071 10,624
Fair value, due within 5 years
Fair value, due after 5 years through 10 years 920 2,106
Fair value, due after 10 years 7,116 8,335
Fair value, total $ 8,036 $ 10,441