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Note 4 - Investment Securities - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Available for sale, amortized cost	$ 213,221	$ 125,729
Available for sale, gross unrealized gains	1,616	435
Available for sale, gross unrealized losses	(175)	(95)
Available for sale	214,662	126,069
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively)	7,569	8,332
Held to maturity, gross unrealized gains	413	300
Held to maturity, gross unrealized losses	0	0
Securities held to maturity, fair value	7,982	8,632
US Government Agencies Debt Securities [Member]
Available for sale, amortized cost	1,258	1,591
Available for sale, gross unrealized gains	30	0
Available for sale, gross unrealized losses	0	(19)
Available for sale	1,288	1,572
Small Business Administration Agency Securities [Member]
Available for sale, amortized cost	4,262	4,671
Available for sale, gross unrealized gains	253	42
Available for sale, gross unrealized losses	0	(22)
Available for sale	4,515	4,691
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available for sale, amortized cost	17,530	19,126
Available for sale, gross unrealized gains	294	74
Available for sale, gross unrealized losses	(6)	(29)
Available for sale	17,818	19,171
Collateralized Mortgage Obligations [Member]
Available for sale, amortized cost	45,948	11,641
Available for sale, gross unrealized gains	479	38
Available for sale, gross unrealized losses	(91)	(25)
Available for sale	46,336	11,654
Commercial Paper [Member]
Available for sale, amortized cost	109,188
Available for sale, gross unrealized gains	0
Available for sale, gross unrealized losses	0
Available for sale	109,188
Corporate Debt Securities [Member]
Available for sale, amortized cost	33,412	88,700
Available for sale, gross unrealized gains	560	281
Available for sale, gross unrealized losses	(42)	0
Available for sale	33,930	88,981
Municipal Bonds [Member]
Available for sale, amortized cost	1,623
Available for sale, gross unrealized gains	0
Available for sale, gross unrealized losses	(36)
Available for sale	1,587
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively)	4,772	4,827
Held to maturity, gross unrealized gains	257	153
Held to maturity, gross unrealized losses	0	0
Securities held to maturity, fair value	5,029	4,980
Taxable Municipal Bonds [Member]
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively)	2,797	3,505
Held to maturity, gross unrealized gains	156	147
Held to maturity, gross unrealized losses	0	0
Securities held to maturity, fair value	$ 2,953	$ 3,652

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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