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Note 4 - Investment Securities - Expected Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Less than one year, Available for sale, Amortized Cost	$ 114,199	$ 74,577
Less than one year, Available for sale, Estimated Fair Value	114,233	74,598
More than one year to five years, Available for sale, Amortized Cost	44,937	26,622
Available for sale, Estimated Fair Value, More than one year to five years	45,737	26,629
More than five years to ten years, Available for sale, Amortized Cost	48,462	20,518
More than five years to ten years, Available for sale, Estimated Fair Value	49,107	20,812
More than ten years, Available for sale, Amortized Cost	5,623	4,012
More than ten years, Available for sale, Estimated Fair Value	5,585	4,030
Available for sale, amortized cost	213,221	125,729
Available for sale	214,662	126,069
Less than one year, Held to Maturity, Amortized Cost	979	285
Held to maturity, Estimated Fair Value	998	289
More than one year to five years, Held to maturity, Amortized Cost	1,818	2,756
More than one year to five years, Held to Maturity, Estimated Fair Value	1,955	2,824
More than five years to ten years, Held to maturity Amortized Cost	874	870
More than five years to ten years, Held to Maturity, Amortized Cost	922	958
More than ten years, Held to Maturity, Amortized Cost	3,898	4,421
More than ten years, Held to Maturity, Estimated Fair Value	4,107	4,561
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively)	7,569	8,332
Securities held to maturity, fair value	7,982	8,632
US Government Agencies Debt Securities [Member]
Less than one year, Available for sale, Amortized Cost	0	0
Less than one year, Available for sale, Estimated Fair Value	0	0
More than one year to five years, Available for sale, Amortized Cost	1,258	1,591
Available for sale, Estimated Fair Value, More than one year to five years	1,288	1,572
More than five years to ten years, Available for sale, Amortized Cost	0	0
More than five years to ten years, Available for sale, Estimated Fair Value	0	0
More than ten years, Available for sale, Amortized Cost	0	0
More than ten years, Available for sale, Estimated Fair Value	0	0
Available for sale, amortized cost	1,258	1,591
Available for sale	1,288	1,572
Small Business Administration Agency Securities [Member]
Less than one year, Available for sale, Amortized Cost	0	0
Less than one year, Available for sale, Estimated Fair Value	0	0
More than one year to five years, Available for sale, Amortized Cost	596	714
Available for sale, Estimated Fair Value, More than one year to five years	629	725
More than five years to ten years, Available for sale, Amortized Cost	3,666	3,957
More than five years to ten years, Available for sale, Estimated Fair Value	3,886	3,966
More than ten years, Available for sale, Amortized Cost	0	0
More than ten years, Available for sale, Estimated Fair Value	0	0
Available for sale, amortized cost	4,262	4,671
Available for sale	4,515	4,691
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Less than one year, Available for sale, Amortized Cost	3,010	3,663
Less than one year, Available for sale, Estimated Fair Value	3,014	3,679
More than one year to five years, Available for sale, Amortized Cost	14,520	13,027
Available for sale, Estimated Fair Value, More than one year to five years	14,804	13,059
More than five years to ten years, Available for sale, Amortized Cost	0	2,436
More than five years to ten years, Available for sale, Estimated Fair Value	0	2,433
More than ten years, Available for sale, Amortized Cost	0	0
More than ten years, Available for sale, Estimated Fair Value	0	0
Available for sale, amortized cost	17,530	19,126
Available for sale	17,818	19,171
Collateralized Mortgage Obligations [Member]
Less than one year, Available for sale, Amortized Cost	0	0
Less than one year, Available for sale, Estimated Fair Value	0	0
More than one year to five years, Available for sale, Amortized Cost	13,895	9,288
Available for sale, Estimated Fair Value, More than one year to five years	14,274	9,265
More than five years to ten years, Available for sale, Amortized Cost	32,053	2,353
More than five years to ten years, Available for sale, Estimated Fair Value	32,062	2,389
More than ten years, Available for sale, Amortized Cost	0	0
More than ten years, Available for sale, Estimated Fair Value	0	0
Available for sale, amortized cost	45,948	11,641
Available for sale	46,336	11,654
Commercial Paper [Member]
Less than one year, Available for sale, Amortized Cost	109,188
Less than one year, Available for sale, Estimated Fair Value	109,188
More than one year to five years, Available for sale, Amortized Cost	0
Available for sale, Estimated Fair Value, More than one year to five years	0
More than five years to ten years, Available for sale, Amortized Cost	0
More than five years to ten years, Available for sale, Estimated Fair Value	0
More than ten years, Available for sale, Amortized Cost	0
More than ten years, Available for sale, Estimated Fair Value	0
Available for sale, amortized cost	109,188
Available for sale	109,188
Corporate Debt Securities [Member]
Less than one year, Available for sale, Amortized Cost	2,001	70,914
Less than one year, Available for sale, Estimated Fair Value	2,031	70,919
More than one year to five years, Available for sale, Amortized Cost	14,668	2,002
Available for sale, Estimated Fair Value, More than one year to five years	14,742	2,008
More than five years to ten years, Available for sale, Amortized Cost	12,743	11,772
More than five years to ten years, Available for sale, Estimated Fair Value	13,159	12,024
More than ten years, Available for sale, Amortized Cost	4,000	4,012
More than ten years, Available for sale, Estimated Fair Value	3,998	4,030
Available for sale, amortized cost	33,412	88,700
Available for sale	33,930	88,981
Municipal Bonds [Member]
Less than one year, Available for sale, Amortized Cost	0
Less than one year, Available for sale, Estimated Fair Value	0
More than one year to five years, Available for sale, Amortized Cost	0
Available for sale, Estimated Fair Value, More than one year to five years	0
More than five years to ten years, Available for sale, Amortized Cost	0
More than five years to ten years, Available for sale, Estimated Fair Value	0
More than ten years, Available for sale, Amortized Cost	1,623
More than ten years, Available for sale, Estimated Fair Value	1,587
Available for sale, amortized cost	1,623
Available for sale	1,587
Less than one year, Held to Maturity, Amortized Cost	0	0
Held to maturity, Estimated Fair Value	0	0
More than one year to five years, Held to maturity, Amortized Cost	0	40
More than one year to five years, Held to Maturity, Estimated Fair Value	0	40
More than five years to ten years, Held to maturity Amortized Cost	874	366
More than five years to ten years, Held to Maturity, Amortized Cost	922	379
More than ten years, Held to Maturity, Amortized Cost	3,898	4,421
More than ten years, Held to Maturity, Estimated Fair Value	4,107	4,561
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively)	4,772	4,827
Securities held to maturity, fair value	5,029	4,980
Taxable Municipal Bonds [Member]
Less than one year, Held to Maturity, Amortized Cost	979	285
Held to maturity, Estimated Fair Value	998	289
More than one year to five years, Held to maturity, Amortized Cost	1,818	2,716
More than one year to five years, Held to Maturity, Estimated Fair Value	1,955	2,784
More than five years to ten years, Held to maturity Amortized Cost	0	504
More than five years to ten years, Held to Maturity, Amortized Cost	0	579
More than ten years, Held to Maturity, Amortized Cost	0	0
More than ten years, Held to Maturity, Estimated Fair Value	0	0
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively)	2,797	3,505
Securities held to maturity, fair value	$ 2,953	$ 3,652

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