Note 4 - Securities Available for Sale (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Debt Securities, Available-for-sale [Table Text Block]

(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2021
Mortgage-backed securities:
Federal National Mortgage Association (FNMA)	$	138,628		550		(1,367	)		137,811
Federal Home Loan Mortgage Corporation (FHLMC)		108,599		126		(1,189	)		107,536
Collateralized mortgage obligations:
FNMA		48		2		0			50
		247,275		678		(2,556	)		245,397
Other marketable securities:
U.S. Government agency obligations		39,991		56		(337	)		39,710
Corporate preferred stock		700		0		(42	)		658
		40,691		56		(379	)		40,368
	$	287,966		734		(2,935	)		285,765
December 31, 2020
Mortgage-backed securities:
FNMA	$	68,699		1,313		(3	)		70,009
FHLMC		31,025		327		0			31,352
Collateralized mortgage obligations:
FNMA		97		6		0			103
		99,821		1,646		(3	)		101,464
Other marketable securities:
U.S. Government agency obligations		45,029		204		0			45,233
Municipal obligations		725		1		0			726
Corporate obligations		37		0		0			37
Corporate preferred stock		700		0		(70	)		630
		46,491		205		(70	)		46,626
	$	146,312		1,851		(73	)		148,090

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less Than Twelve Months							Twelve Months or More							Total
(Dollars in thousands)	# of Investments		Fair Value		Unrealized Losses			# of Investments		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
December 31, 2021
Mortgage backed securities:
FNMA		19	$	98,423		(1,234	)		2	$	6,810		(133	)	$	105,233		(1,367	)
FHLMC		17		85,624		(1,038	)		2		7,664		(151	)		93,288		(1,189	)
Other marketable securities:
U.S. government  agency obligations		7		34,659		(337	)		0		0		0			34,659		(337	)
Corporate preferred stock		0		0		0			1		658		(42	)		658		(42	)
Total temporarily impaired securities		43	$	218,706		(2,609	)		5	$	15,132		(326	)	$	233,838		(2,935	)
December 31, 2020
Mortgage backed securities:
FNMA		1	$	4,956		(3	)		0	$	0		0		$	4,956		(3	)
Other marketable securities:
Corporate preferred stock		0		0		0			1		630		(70	)		630		(70	)
Total temporarily impaired securities		1	$	4,956		(3	)		1	$	630		(70	)	$	5,586		(73	)

Available-for-sale Securities [Member]

Notes Tables

Contractual Obligation, Fiscal Year Maturity [Table Text Block]

(Dollars in thousands)	Amortized Cost		Fair Value
Due one year or less	$	71,861		71,318
Due after one year through five years		170,404		169,129
Due after five years through fifteen years		45,700		45,317
Due after fifteen years		1		1
Total	$	287,966		285,765