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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Amortized cost, due within 5 years $ 3,787 $ 31,630
Amortized cost, due after 5 years through 10 years 28,362 5,171
Amortized cost, due after 10 years 74,564 59,746
Available-for-sale securities, amortized cost 106,713 96,547
Fair value, due within 5 years 3,742 30,756
Fair value, due after 5 years through 10 years 21,704 5,188
Fair value, due after 10 years 60,471 58,397
Fair value, total 85,917 94,341
Corporate Debt Securities [Member]    
Amortized cost, due within 5 years 3,787 17,754
Amortized cost, due after 5 years through 10 years 15,994 0
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 19,781 17,754
Fair value, due within 5 years 3,742 16,921
Fair value, due after 5 years through 10 years 10,875 0
Fair value, due after 10 years 0 0
Fair value, total 14,617 16,921
Subordinated Notes [Member]    
Amortized cost, due within 5 years 0 0
Amortized cost, due after 5 years through 10 years 5,000 4,608
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 5,000 4,608
Fair value, due within 5 years 0 0
Fair value, due after 5 years through 10 years 4,735 4,626
Fair value, due after 10 years 0 0
Fair value, total 4,735 4,626
SBA Loan Pools [Member]    
Amortized cost, due within 5 years 0 0
Amortized cost, due after 5 years through 10 years 1,495 0
Amortized cost, due after 10 years 5,342 5,772
Available-for-sale securities, amortized cost 6,837 5,772
Fair value, due within 5 years 0 0
Fair value, due after 5 years through 10 years 1,485 0
Fair value, due after 10 years 4,372 5,603
Fair value, total 5,857 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 561 563
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 561 563
Fair value, due within 5 years 0 0
Fair value, due after 5 years through 10 years 477 562
Fair value, due after 10 years 0 0
Fair value, total 477 562
Available-for-sale Securities with Single Maturity Dates [Member]    
Amortized cost, due within 5 years 3,787 17,754
Amortized cost, due after 5 years through 10 years 23,050 5,171
Amortized cost, due after 10 years 5,342 5,772
Available-for-sale securities, amortized cost 32,179 28,697
Fair value, due within 5 years 3,742 16,921
Fair value, due after 5 years through 10 years 17,572 5,188
Fair value, due after 10 years 4,372 5,603
Fair value, total 25,686 27,712
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Amortized cost, due within 5 years 0 13,876
Amortized cost, due after 5 years through 10 years 5,312 0
Amortized cost, due after 10 years 69,222 53,974
Available-for-sale securities, amortized cost 74,534 67,850
Fair value, due within 5 years 0 13,835
Fair value, due after 5 years through 10 years 4,132 0
Fair value, due after 10 years 56,099 52,794
Fair value, total $ 60,231 $ 66,629