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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Amortized cost, due within 5 years $ 7,438 $ 7,823
Amortized cost, due after 5 years through 10 years 30,588 30,226
Amortized cost, due after 10 years 10,533 10,811
Available-for-sale securities, amortized cost 48,559 48,860
Fair value, due within 5 years 7,576 7,961
Fair value, due after 5 years through 10 years 29,628 29,497
Fair value, due after 10 years 10,619 10,859
Fair value, total 47,823 48,317
Available-for-sale securities 47,823 48,317
Corporate Debt Securities [Member]    
Amortized cost, due within 5 years 4,015 4,018
Amortized cost, due after 5 years through 10 years 14,000 14,000
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost 18,015 18,018
Fair value, due within 5 years 4,139 4,151
Fair value, due after 5 years through 10 years 13,111 13,162
Fair value, due after 10 years
Fair value, total 17,250 17,313
Available-for-sale securities 17,250 17,313
Subordinated Notes [Member]    
Amortized cost, due within 5 years
Amortized cost, due after 5 years through 10 years 9,033 9,022
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost 9,033 9,022
Fair value, due within 5 years
Fair value, due after 5 years through 10 years 9,013 9,204
Fair value, due after 10 years
Fair value, total 9,013 9,204
Available-for-sale securities 9,013 9,204
SBA Loan Pools [Member]    
Amortized cost, due within 5 years
Amortized cost, due after 5 years through 10 years 5,369 5,157
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost 5,369 5,157
Fair value, due within 5 years
Fair value, due after 5 years through 10 years 5,301 5,115
Fair value, due after 10 years
Fair value, total 5,301 5,115
Available-for-sale securities 5,301 5,115
US States and Political Subdivisions Debt Securities [Member]    
Amortized cost, due within 5 years  
Amortized cost, due after 5 years through 10 years 564  
Amortized cost, due after 10 years  
Available-for-sale securities, amortized cost 564  
Fair value, due within 5 years  
Fair value, due after 5 years through 10 years 554  
Fair value, due after 10 years  
Fair value, total 554  
Available-for-sale securities 554  
Available-for-sale Securities with Single Maturity Dates [Member]    
Amortized cost, due within 5 years 4,015 4,018
Amortized cost, due after 5 years through 10 years 28,966 28,179
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost 32,981 32,197
Fair value, due within 5 years 4,139 4,151
Fair value, due after 5 years through 10 years 27,979 27,481
Fair value, due after 10 years
Fair value, total 32,118 31,632
Available-for-sale securities 32,118 31,632
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Amortized cost, due within 5 years 3,423 3,805
Amortized cost, due after 5 years through 10 years 1,622 2,047
Amortized cost, due after 10 years 10,533 10,811
Available-for-sale securities, amortized cost 15,578 16,663
Fair value, due within 5 years 3,437 3,810
Fair value, due after 5 years through 10 years 1,649 2,016
Fair value, due after 10 years 10,619 10,859
Fair value, total 15,705 16,685
Available-for-sale securities $ 15,705 $ 16,685