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Note 16 - Employee Benefit Plans - Fair Values of Pension Plans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Fair value of pension plan assets	$ 257,620	$ 236,935
Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets	7,423	5,161
Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets	250,197	231,774
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	3,209	3,113
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets	3,148	1,684
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets	61	1,429
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	86,499	85,641
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets	2,425	1,857
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets	84,074	83,784
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	146,742	126,703
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets	1,850	1,620
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets	144,892	125,083
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	21,170	21,478
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	21,170	21,478
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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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