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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Amortized cost, due within 5 years $ 39,516 $ 11,299
Amortized cost, due after 5 years through 10 years 10,968 26,772
Amortized cost, due after 10 years 58,067 11,889
Available-for-sale securities, amortized cost 108,551 49,960
Fair value, due within 5 years 39,822 11,539
Fair value, due after 5 years through 10 years 11,032 25,744
Fair value, due after 10 years 57,758 11,979
Fair value, total 108,612 49,262
Corporate Debt Securities [Member]    
Amortized cost, due within 5 years 16,012 4,014
Amortized cost, due after 5 years through 10 years 2,241 14,000
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 18,253 18,014
Fair value, due within 5 years 16,330 4,274
Fair value, due after 5 years through 10 years 2,262 13,016
Fair value, due after 10 years 0 0
Fair value, total 18,592 17,290
Subordinated Notes [Member]    
Amortized cost, due within 5 years 0 2,000
Amortized cost, due after 5 years through 10 years 4,609 7,036
Amortized cost, due after 10 years 0 0
Available-for-sale securities, amortized cost 4,609 9,036
Fair value, due within 5 years 0 2,003
Fair value, due after 5 years through 10 years 4,674 7,002
Fair value, due after 10 years 0 0
Fair value, total 4,674 9,005
SBA Loan Pools [Member]    
Amortized cost, due within 5 years 1,571 1,921
Amortized cost, due after 5 years through 10 years 3,241 3,706
Amortized cost, due after 10 years 6,011 0
Available-for-sale securities, amortized cost 10,823 5,627
Fair value, due within 5 years 1,557 1,899
Fair value, due after 5 years through 10 years 3,216 3,668
Fair value, due after 10 years 6,006 0
Fair value, total 10,779 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 563 567
Fair value, due after 10 years 0 0
Fair value, total 563 567
Available-for-sale Securities with Single Maturity Dates [Member]    
Amortized cost, due within 5 years 17,583 7,935
Amortized cost, due after 5 years through 10 years 10,654 25,306
Amortized cost, due after 10 years 6,011 0
Available-for-sale securities, amortized cost 34,248 33,241
Fair value, due within 5 years 17,887 8,176
Fair value, due after 5 years through 10 years 10,715 24,253
Fair value, due after 10 years 6,006 0
Fair value, total 34,608 32,429
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Amortized cost, due within 5 years 21,933 3,364
Amortized cost, due after 5 years through 10 years 314 1,466
Amortized cost, due after 10 years 52,056 11,889
Available-for-sale securities, amortized cost 74,303 16,719
Fair value, due within 5 years 21,935 3,363
Fair value, due after 5 years through 10 years 317 1,491
Fair value, due after 10 years 51,752 11,979
Fair value, total $ 74,004 $ 16,833