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Note 16 - Employee Benefit Plans - Fair Values of Pension Plans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Fair value of pension plan assets	$ 164,364	$ 188,838
Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets	1,558	4,444
Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets	162,806	184,394
Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets	0	0
Cash and Cash Equivalents [Member]
Fair value of pension plan assets	1,558	1,254
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets	1,558	1,123
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets	0	131
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets	0	0
Equity Securities [Member]
Fair value of pension plan assets	54,308	64,343
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets	0	1,786
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets	54,308	62,557
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets	0	0
Corporate Bonds and Other Fixed Income Securities [Member]
Fair value of pension plan assets	97,215	112,593
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets	0	1,535
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets	97,215	111,058
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets	0	0
Other Debt Obligations [Member]
Fair value of pension plan assets	11,283	10,648
Other Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets	0	0
Other Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets	11,283	10,648
Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets	$ 0	$ 0

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-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

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-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

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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