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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Amortized cost, due within 5 years $ 31,630 $ 11,299
Amortized cost, due after 5 years through 10 years 5,171 26,772
Amortized cost, due after 10 years 59,746 11,889
Available-for-sale securities, amortized cost 96,547 49,960
Fair value, due within 5 years 30,756 11,539
Fair value, due after 5 years through 10 years 5,188 25,744
Fair value, due after 10 years 58,397 11,979
Fair value, total 94,341 49,262
Corporate Debt Securities [Member]    
Amortized cost, due within 5 years 17,754 4,014
Amortized cost, due after 5 years through 10 years 0 14,000
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 17,754 18,014
Fair value, due within 5 years 16,921 4,274
Fair value, due after 5 years through 10 years 0 13,016
Fair value, due after 10 years 0 0
Fair value, total 16,921 17,290
Subordinated Notes [Member]    
Amortized cost, due within 5 years 0 2,000
Amortized cost, due after 5 years through 10 years 4,608 7,036
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 4,608 9,036
Fair value, due within 5 years 0 2,003
Fair value, due after 5 years through 10 years 4,626 7,002
Fair value, due after 10 years 0 0
Fair value, total 4,626 9,005
SBA Loan Pools [Member]    
Amortized cost, due within 5 years 0 1,921
Amortized cost, due after 5 years through 10 years 0 3,706
Amortized cost, due after 10 years 5,772 0
Available-for-sale securities, amortized cost 5,772 5,627
Fair value, due within 5 years 0 1,899
Fair value, due after 5 years through 10 years 0 3,668
Fair value, due after 10 years 5,603 0
Fair value, total 5,603 5,567
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 563 564
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 563 564
Fair value, due within 5 years 0 0
Fair value, due after 5 years through 10 years 562 567
Fair value, due after 10 years 0 0
Fair value, total 562 567
Available-for-sale Securities with Single Maturity Dates [Member]    
Amortized cost, due within 5 years 17,754 7,935
Amortized cost, due after 5 years through 10 years 5,171 25,306
Amortized cost, due after 10 years 5,772 0
Available-for-sale securities, amortized cost 28,697 33,241
Fair value, due within 5 years 16,921 8,176
Fair value, due after 5 years through 10 years 5,188 24,253
Fair value, due after 10 years 5,603 0
Fair value, total 27,712 32,429
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Amortized cost, due within 5 years 13,876 3,364
Amortized cost, due after 5 years through 10 years 0 1,466
Amortized cost, due after 10 years 53,974 11,889
Available-for-sale securities, amortized cost 67,850 16,719
Fair value, due within 5 years 13,835 3,363
Fair value, due after 5 years through 10 years 0 1,491
Fair value, due after 10 years 52,794 11,979
Fair value, total $ 66,629 $ 16,833