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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	Dec. 31, 2023	Dec. 31, 2022
Available for sale, amortized cost	$ 347,070	$ 288,088
Available for sale, gross unrealized gains	620	3
Available for sale, gross unrealized losses	(28,729)	(31,261)
Available for sale	318,961	256,830
Held to maturity (fair value of $5,097 and $5,563 at December 31, 2023 and December 31, 2022)	5,209	5,729
Held to maturity, gross unrealized gains	3	7
Held to maturity, gross unrealized losses	(115)	(173)
Securities held to maturity, fair value	5,097	5,563
US Government Agencies Debt Securities [Member]
Available for sale, amortized cost	8,705	5,012
Available for sale, gross unrealized gains	0	0
Available for sale, gross unrealized losses	(544)	(517)
Available for sale	8,161	4,495
Small Business Administration Agency Securities [Member]
Available for sale, amortized cost	13,289	2,634
Available for sale, gross unrealized gains	144	0
Available for sale, gross unrealized losses	(216)	(223)
Available for sale	13,217	2,411
Residential Mortgage-Backed Securities [Member]
Available for sale, amortized cost	40,507	44,809
Available for sale, gross unrealized gains	0	0
Available for sale, gross unrealized losses	(5,855)	(6,752)
Available for sale	34,652	38,057
Residential Collateralized Mortgage Obligations [Member]
Available for sale, amortized cost	94,071	82,759
Available for sale, gross unrealized gains	454	0
Available for sale, gross unrealized losses	(12,198)	(12,856)
Available for sale	82,327	69,903
Commercial Mortgage-Backed Securities [Member]
Available for sale, amortized cost		4,887
Available for sale, gross unrealized gains		0
Available for sale, gross unrealized losses		(16)
Available for sale		4,871
Commercial Collateralized Mortgage Obligations [Member]
Available for sale, amortized cost	69,941	44,591
Available for sale, gross unrealized gains	22	0
Available for sale, gross unrealized losses	(2,664)	(2,901)
Available for sale	67,299	41,690
Commercial Paper [Member]
Available for sale, amortized cost	73,121	49,551
Available for sale, gross unrealized gains	0	2
Available for sale, gross unrealized losses	(16)	(16)
Available for sale	73,105	49,537
Corporate Debt Securities [Member]
Available for sale, amortized cost	34,800	41,176
Available for sale, gross unrealized gains	0	1
Available for sale, gross unrealized losses	(4,109)	(4,165)
Available for sale	30,691	37,012
Municipal Bonds [Member]
Available for sale, amortized cost	12,636	12,669
Available for sale, gross unrealized gains	0	0
Available for sale, gross unrealized losses	(3,127)	(3,815)
Available for sale	9,509	8,854
Held to maturity (fair value of $5,097 and $5,563 at December 31, 2023 and December 31, 2022)	4,708	4,726
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(115)	(170)
Securities held to maturity, fair value	4,593	4,556
Taxable Municipal Bonds [Member]
Held to maturity (fair value of $5,097 and $5,563 at December 31, 2023 and December 31, 2022)	501	1,003
Held to maturity, gross unrealized gains	3	7
Held to maturity, gross unrealized losses	0	(3)
Securities held to maturity, fair value	$ 504	$ 1,007

X

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
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-Section 50
-Paragraph 2
-Subparagraph (b)
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