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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Amortized cost, due within 5 years $ 17,776 $ 31,630
Amortized cost, due after 5 years through 10 years 14,968 5,171
Amortized cost, due after 10 years 59,436 59,746
Available-for-sale securities, amortized cost 92,180 96,547
Fair value, due within 5 years 14,945 30,756
Fair value, due after 5 years through 10 years 11,694 5,188
Fair value, due after 10 years 50,332 58,397
Fair value, total 76,971 94,341
Corporate Debt Securities [Member]    
Amortized cost, due within 5 years 7,790 17,754
Amortized cost, due after 5 years through 10 years 12,000 0
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 19,790 17,754
Fair value, due within 5 years 6,761 16,921
Fair value, due after 5 years through 10 years 8,883 0
Fair value, due after 10 years 0 0
Fair value, total 15,644 16,921
Subordinated Notes [Member]    
Amortized cost, due within 5 years 0 0
Amortized cost, due after 5 years through 10 years 2,000 4,608
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 2,000 4,608
Fair value, due within 5 years 0 0
Fair value, due after 5 years through 10 years 1,921 4,626
Fair value, due after 10 years 0 0
Fair value, total 1,921 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 4,822 5,603
Fair value, total 4,822 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 499 562
Fair value, due after 10 years 0 0
Fair value, total 499 562
Available-for-sale Securities with Single Maturity Dates [Member]    
Amortized cost, due within 5 years 7,790 17,754
Amortized cost, due after 5 years through 10 years 14,562 5,171
Amortized cost, due after 10 years 5,567 5,772
Available-for-sale securities, amortized cost 27,919 28,697
Fair value, due within 5 years 6,761 16,921
Fair value, due after 5 years through 10 years 11,303 5,188
Fair value, due after 10 years 4,822 5,603
Fair value, total 22,886 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 406 0
Amortized cost, due after 10 years 53,869 53,974
Available-for-sale securities, amortized cost 64,261 67,850
Fair value, due within 5 years 8,184 13,835
Fair value, due after 5 years through 10 years 391 0
Fair value, due after 10 years 45,510 52,794
Fair value, total $ 54,085 $ 66,629