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Note 2 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 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 4,736 8,492
Amortized cost, total 21,236 24,624
Fair value, due within 5 years 1,025 9,987
Fair value, due after 5 years through 10 years 15,520 6,106
Fair value, due after 10 years 4,656 8,335
Available-for-sale securities, at fair value 21,201 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 8,937
Fair value, due after 10 years
Available-for-sale securities, at fair value 8,937 8,961
US Government Agencies Debt Securities [Member]    
Amortized cost, due within 5 years  
Amortized cost, due after 5 years through 10 years  
Amortized cost, due after 10 years  
Amortized cost, total  
Fair value, due within 5 years  
Fair value, due after 5 years through 10 years  
Fair value, due after 10 years  
Available-for-sale securities, at fair value  
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 1,025 1,026
Fair value, due after 5 years through 10 years 6,583 4,000
Fair value, due after 10 years
Available-for-sale securities, at fair value 7,608 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 1,025 9,987
Fair value, due after 5 years through 10 years 15,520 4,000
Fair value, due after 10 years
Available-for-sale securities, at fair value 16,545 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 4,736 8,492
Amortized cost, total 4,736 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 4,656 8,335
Available-for-sale securities, at fair value $ 4,656 $ 10,441