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Note 2 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Amortized cost, due within 5 years $ 1,000 $ 10,000
Amortized cost, due after 5 years through 10 years 15,500 6,132
Amortized cost, due after 10 years 8,468 8,492
Amortized cost, total 24,968 24,624
Fair value, due within 5 years 1,020 9,987
Fair value, due after 5 years through 10 years 15,539 6,106
Fair value, due after 10 years 8,422 8,335
Available-for-sale securities, at fair value 24,981 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
Amortized cost, total 9,000 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
Available-for-sale securities, at fair value 8,954 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 1,020 1,026
Fair value, due after 5 years through 10 years 6,585 4,000
Fair value, due after 10 years
Available-for-sale securities, at fair value 7,605 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
Amortized cost, total 16,500 14,000
Fair value, due within 5 years 1,020 9,987
Fair value, due after 5 years through 10 years 15,539 4,000
Fair value, due after 10 years
Available-for-sale securities, at fair value 16,559 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 2,132
Amortized cost, due after 10 years 8,468 8,492
Amortized cost, total 8,468 10,624
Fair value, due within 5 years
Fair value, due after 5 years through 10 years 2,106
Fair value, due after 10 years 8,422 8,335
Available-for-sale securities, at fair value $ 8,422 $ 10,441