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Note 16 - Employee Benefit Plans - Fair Values of Pension Plans (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Jun. 30, 2021
Fair value of pension plan assets $ 188,838 $ 257,620
Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 4,444 7,423
Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 184,394 250,197
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 1,254 3,209
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 1,123 3,148
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 131 61
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 64,343 86,499
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 1,786 2,425
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 62,557 84,074
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 112,593 146,742
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 1,535 1,850
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 111,058 144,892
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 10,648 21,170
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 10,648 21,170
Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets $ 0 $ 0