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Note 10 - Components of Net Periodic Pension Cost (Details Textual) $ in Thousands			3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Jun. 01, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment			$ (3,501)	$ (0)	$ (3,501)	$ (0)
Pension Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		5.80%
Pension Plan [Member] | Fixed Income Funds [Member] | Maximum [Member] | Standard & Poor's, BBB Rating [Member]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	5.00%		5.00%		5.00%
Pension Plan [Member] | Fixed Income Funds [Member] | Moody's, Baa1 Rating [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	5.00%		5.00%		5.00%
Pension Plan [Member] | Single Investment Security, Excluding Fixed Income Investments [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	5.00%		5.00%		5.00%
Pension Plan [Member] | Mutual Fund [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	10.00%		10.00%		10.00%
Pension Plan [Member] | First of Long Island Corporation [Member]
Defined Benefit Plan, Funded (Unfunded) Status of Plan		$ 11,200
Defined Benefit Plan, Minimum Age of Employee		21
Defined Benefit Plan, Minimum Service (Month)		12 months
Defined Benefit Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		2.00%
Defined Benefit Plan, Employers Matching Contribution, Vesting Period (Year)		4 years
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.41%		5.41%		5.41%
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	$ 2,000
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment			$ (3,500)
Defined Benefit Plan, Funded Percentage	134.00%		134.00%		134.00%

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined benefit plan.

+ References

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Minimum age of employee to participate in the defined benefit plan.

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- Definition

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+ References

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-Topic 715
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-Section 50
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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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- Definition

Percentage of investment to total investment within defined benefit plan asset category.

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