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Note 10 - Components of Net Periodic Pension Cost (Details Textual) - Pension Plan [Member] $ in Millions	Jun. 01, 2025 USD ($)	Jun. 30, 2025
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%
Fixed Income Funds [Member] | Moody's, Baa1 Rating [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage		5.00%
Single Investment Security, Excluding Fixed Income Investments [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage		5.00%
Mutual Fund [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage		10.00%
First of Long Island Corporation [Member]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 11.2
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

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Period of vesting for employer's matching contributions to a defined benefit plan.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Minimum service period of employee to participate in defined benefit plan.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480535/715-20-45-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

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Period Type:	instant

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (c)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

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- Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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- Details

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X

- Details

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