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Note 4 - Investment Securities - Expected Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Less than one year, Available for sale, Amortized Cost	$ 76,153	$ 53,256
Less than one year, Available for sale, Estimated Fair Value	76,140	53,243
More than one year to five years, Available for sale, Amortized Cost	92,104	73,970
Available for sale, Estimated Fair Value, More than one year to five years	86,972	68,471
More than five years to ten years, Available for sale, Amortized Cost	153,816	142,849
More than five years to ten years, Available for sale, Estimated Fair Value	136,671	122,326
More than ten years, Available for sale, Amortized Cost	24,997	18,013
More than ten years, Available for sale, Estimated Fair Value	19,178	12,790
Available for sale, amortized cost	347,070	288,088
Available for sale	318,961	256,830
Less than one year, Held to Maturity, Amortized Cost	0	501
Less than one year, Held to maturity, Estimated Fair Value	0	498
More than one year to five years, Held to maturity, Amortized Cost	501	502
More than one year to five years, Held to Maturity, Estimated Fair Value	504	509
More than five years to ten years, Held to maturity Amortized Cost	2,952	1,739
More than five years to ten years, Held to maturity Estimated Fair Value	2,873	1,692
More than ten years, Held to Maturity, Amortized Cost	1,756	2,987
More than ten years, Held to Maturity, Estimated Fair Value	1,720	2,864
Held to maturity (fair value of $5,097 and $5,563 at December 31, 2023 and December 31, 2022)	5,209	5,729
Securities held to maturity, fair value	5,097	5,563
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	8,705	5,012
Available for sale, Estimated Fair Value, More than one year to five years	8,161	4,495
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	8,705	5,012
Available for sale	8,161	4,495
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	2,292	2,634
Available for sale, Estimated Fair Value, More than one year to five years	2,095	2,411
More than five years to ten years, Available for sale, Amortized Cost	10,997	0
More than five years to ten years, Available for sale, Estimated Fair Value	11,122	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	13,289	2,634
Available for sale	13,217	2,411
Residential Mortgage-Backed 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	11,023	13,013
Available for sale, Estimated Fair Value, More than one year to five years	9,986	11,598
More than five years to ten years, Available for sale, Amortized Cost	19,762	29,114
More than five years to ten years, Available for sale, Estimated Fair Value	16,965	24,361
More than ten years, Available for sale, Amortized Cost	9,722	2,682
More than ten years, Available for sale, Estimated Fair Value	7,701	2,098
Available for sale, amortized cost	40,507	44,809
Available for sale	34,652	38,057
Residential Collateralized Mortgage Obligations [Member]
Less than one year, Available for sale, Amortized Cost	18	0
Less than one year, Available for sale, Estimated Fair Value	17	0
More than one year to five years, Available for sale, Amortized Cost	36,876	20,687
Available for sale, Estimated Fair Value, More than one year to five years	35,758	19,646
More than five years to ten years, Available for sale, Amortized Cost	57,177	62,072
More than five years to ten years, Available for sale, Estimated Fair Value	46,552	50,257
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	94,071	82,759
Available for sale	82,327	69,903
Commercial Collateralized Mortgage Obligations [Member]
Less than one year, Available for sale, Amortized Cost	3,014	0
Less than one year, Available for sale, Estimated Fair Value	3,018	0
More than one year to five years, Available for sale, Amortized Cost	20,296	16,382
Available for sale, Estimated Fair Value, More than one year to five years	18,481	14,644
More than five years to ten years, Available for sale, Amortized Cost	46,631	28,209
More than five years to ten years, Available for sale, Estimated Fair Value	45,800	27,046
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	69,941	44,591
Available for sale	67,299	41,690
Commercial Paper [Member]
Less than one year, Available for sale, Amortized Cost	73,121	49,551
Less than one year, Available for sale, Estimated Fair Value	73,105	49,537
More than one year to five years, Available for sale, Amortized Cost	0	0
Available for sale, Estimated Fair Value, More than one year to five years	0	0
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	73,121	49,551
Available for sale	73,105	49,537
Corporate Debt Securities [Member]
Less than one year, Available for sale, Amortized Cost	0	3,705
Less than one year, Available for sale, Estimated Fair Value	0	3,706
More than one year to five years, Available for sale, Amortized Cost	12,912	11,355
Available for sale, Estimated Fair Value, More than one year to five years	12,491	10,806
More than five years to ten years, Available for sale, Amortized Cost	19,249	23,454
More than five years to ten years, Available for sale, Estimated Fair Value	16,232	20,662
More than ten years, Available for sale, Amortized Cost	2,639	2,662
More than ten years, Available for sale, Estimated Fair Value	1,968	1,838
Available for sale, amortized cost	34,800	41,176
Available for sale	30,691	37,012
Municipal Bonds [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	0	0
Available for sale, Estimated Fair Value, More than one year to five years	0	0
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	12,636	12,669
More than ten years, Available for sale, Estimated Fair Value	9,509	8,854
Available for sale, amortized cost	12,636	12,669
Available for sale	9,509	8,854
Less than one year, Held to Maturity, Amortized Cost	0	0
Less than one year, Held to maturity, Estimated Fair Value	0	0
More than one year to five years, Held to maturity, Amortized Cost	0	0
More than one year to five years, Held to Maturity, Estimated Fair Value	0	0
More than five years to ten years, Held to maturity Amortized Cost	2,952	1,739
More than five years to ten years, Held to maturity Estimated Fair Value	2,873	1,692
More than ten years, Held to Maturity, Amortized Cost	1,756	2,987
More than ten years, Held to Maturity, Estimated Fair Value	1,720	2,864
Held to maturity (fair value of $5,097 and $5,563 at December 31, 2023 and December 31, 2022)	4,708	4,726
Securities held to maturity, fair value	4,593	4,556
Taxable Municipal Bonds [Member]
Less than one year, Held to Maturity, Amortized Cost	0	501
Less than one year, Held to maturity, Estimated Fair Value	0	498
More than one year to five years, Held to maturity, Amortized Cost	501	502
More than one year to five years, Held to Maturity, Estimated Fair Value	504	509
More than five years to ten years, Held to maturity Amortized Cost	0	0
More than five years to ten years, Held to maturity Estimated Fair Value	0	0
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 $5,097 and $5,563 at December 31, 2023 and December 31, 2022)	501	1,003
Securities held to maturity, fair value	$ 504	1,007
Commercial Mortgage-Backed Securities [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		4,887
Available for sale, Estimated Fair Value, More than one year to five years		4,871
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		4,887
Available for sale		$ 4,871

X

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Amortized cost of 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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