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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized cost, due within 5 years	$ 8,783	$ 11,299
Amortized cost, due after 5 years through 10 years	26,415	26,772
Amortized cost, due after 10 years	23,622	11,889
Available-for-sale securities, amortized cost	58,820	49,960
Fair value, due within 5 years	9,039	11,539
Fair value, due after 5 years through 10 years	25,547	25,744
Fair value, due after 10 years	23,307	11,979
Fair value, total	57,893	49,262
Corporate Debt Securities [Member]
Amortized cost, due within 5 years	4,013	4,014
Amortized cost, due after 5 years through 10 years	14,000	14,000
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost	18,013	18,014
Fair value, due within 5 years	4,285	4,274
Fair value, due after 5 years through 10 years	13,048	13,016
Fair value, due after 10 years
Fair value, total	17,333	17,290
Subordinated Notes [Member]
Amortized cost, due within 5 years	2,000	2,000
Amortized cost, due after 5 years through 10 years	7,040	7,036
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost	9,040	9,036
Fair value, due within 5 years	2,003	2,003
Fair value, due after 5 years through 10 years	7,146	7,002
Fair value, due after 10 years
Fair value, total	9,149	9,005
SBA Loan Pools [Member]
Amortized cost, due within 5 years	1,735	1,921
Amortized cost, due after 5 years through 10 years	3,468	3,706
Amortized cost, due after 10 years	3,133
Available-for-sale securities, amortized cost	8,336	5,627
Fair value, due within 5 years	1,715	1,899
Fair value, due after 5 years through 10 years	3,427	3,668
Fair value, due after 10 years	3,023
Fair value, total	8,165	5,567
US States and Political Subdivisions Debt Securities [Member]
Amortized cost, due within 5 years
Amortized cost, due after 5 years through 10 years	564	564
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost	564	564
Fair value, due within 5 years
Fair value, due after 5 years through 10 years	559	567
Fair value, due after 10 years
Fair value, total	559	567
Available-for-sale Securities with Single Maturity Dates [Member]
Amortized cost, due within 5 years	7,748	7,935
Amortized cost, due after 5 years through 10 years	25,072	25,306
Amortized cost, due after 10 years	3,133
Available-for-sale securities, amortized cost	35,953	33,241
Fair value, due within 5 years	8,003	8,176
Fair value, due after 5 years through 10 years	24,180	24,253
Fair value, due after 10 years	3,023
Fair value, total	35,206	32,429
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost, due within 5 years	1,035	3,364
Amortized cost, due after 5 years through 10 years	1,343	1,466
Amortized cost, due after 10 years	20,489	11,889
Available-for-sale securities, amortized cost	22,867	16,719
Fair value, due within 5 years	1,036	3,363
Fair value, due after 5 years through 10 years	1,367	1,491
Fair value, due after 10 years	20,284	11,979
Fair value, total	$ 22,687	$ 16,833

X

- Definition

Amount after adjustments of available-for-sale debt securities at cost, maturing in the first fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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