Note 13 - Retirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	At December 31,
	2023			2022			2021
	(In thousands)
Service benefit	$	(56	)	$	(19	)	$	(15	)
Interest cost		70			38			30
Net periodic cost	$	14		$	19		$	15

Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]

	At December 31,
	2023			2022			2021
Change in benefit obligation	(In thousands)
Benefit obligation at beginning of year	$	1,401		$	1,527		$	1,654
Service benefit		(56	)		(19	)		(15	)
Interest cost		70			38			30
Benefits paid		(139	)		(145	)		(142	)
Benefit obligation at end of year	$	1,276		$	1,401		$	1,527
Accumulated post-retirement benefit obligation attributable to:
Retirees	$	1,276		$	1,401		$	1,527
Other		-			-			-
Total	$	1,276		$	1,401		$	1,527
Fair value of plan assets		-			-			-
Accumulated post-retirement benefit obligation in excess of plan assets	$	1,276		$	1,401		$	1,527

Defined Benefit Plan, Assumptions [Table Text Block]

	At December 31,
	2023			2022			2021
Weighted-average assumptions used to determine benefit obligations
Discount rate		4.75	%		5.01	%		2.46	%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate		5.01	%		2.46	%		1.80	%

Schedule of Expected Benefit Payments [Table Text Block]

	Estimated future benefit payments
	(In thousands)
2024	$	133
2025		133
2026		133
2027		127
2028		118
Years 2029-2033		424