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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Amortized cost, due within 5 years $ 27,740 $ 31,630
Amortized cost, due after 5 years through 10 years 3,670 5,171
Amortized cost, due after 10 years 61,445 59,746
Available-for-sale securities, amortized cost 92,855 96,547
Fair value, due within 5 years 23,756 30,756
Fair value, due after 5 years through 10 years 3,583 5,188
Fair value, due after 10 years 55,921 58,397
Fair value, total 83,260 94,341
Corporate Debt Securities [Member]    
Amortized cost, due within 5 years 17,754 17,754
Amortized cost, due after 5 years through 10 years 0 0
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 17,754 17,754
Fair value, due within 5 years 14,732 16,921
Fair value, due after 5 years through 10 years 0 0
Fair value, due after 10 years 0 0
Fair value, total 14,732 16,921
Subordinated Notes [Member]    
Amortized cost, due within 5 years 0 0
Amortized cost, due after 5 years through 10 years 3,108 4,608
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 3,108 4,608
Fair value, due within 5 years 0 0
Fair value, due after 5 years through 10 years 3,069 4,626
Fair value, due after 10 years 0 0
Fair value, total 3,069 4,626
SBA Loan Pools [Member]    
Amortized cost, due within 5 years 0 0
Amortized cost, due after 5 years through 10 years 0 0
Amortized cost, due after 10 years 5,567 5,772
Available-for-sale securities, amortized cost 5,567 5,772
Fair value, due within 5 years 0 0
Fair value, due after 5 years through 10 years 0 0
Fair value, due after 10 years 5,055 5,603
Fair value, total 5,055 5,603
US States and Political Subdivisions Debt Securities [Member]    
Amortized cost, due within 5 years 0 0
Amortized cost, due after 5 years through 10 years 562 563
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 562 563
Fair value, due within 5 years 0 0
Fair value, due after 5 years through 10 years 514 562
Fair value, due after 10 years 0 0
Fair value, total 514 562
Available-for-sale Securities with Single Maturity Dates [Member]    
Amortized cost, due within 5 years 17,754 17,754
Amortized cost, due after 5 years through 10 years 3,670 5,171
Amortized cost, due after 10 years 5,567 5,772
Available-for-sale securities, amortized cost 26,991 28,697
Fair value, due within 5 years 14,732 16,921
Fair value, due after 5 years through 10 years 3,583 5,188
Fair value, due after 10 years 5,055 5,603
Fair value, total 23,370 27,712
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Amortized cost, due within 5 years 9,986 13,876
Amortized cost, due after 5 years through 10 years 0 0
Amortized cost, due after 10 years 55,878 53,974
Available-for-sale securities, amortized cost 65,864 67,850
Fair value, due within 5 years 9,024 13,835
Fair value, due after 5 years through 10 years 0 0
Fair value, due after 10 years 50,866 52,794
Fair value, total $ 59,890 $ 66,629