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Note 16 - Employee Benefit Plans - Fair Values of Pension Plans (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Jun. 30, 2024
Fair value of pension plan assets $ 169,272 $ 164,545
Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 341 2,792
Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 168,931 161,753
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 341 2,792
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 341 2,792
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 0 0
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 63,990 53,111
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 0 0
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 63,990 53,111
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 96,042 96,522
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 0 0
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 96,042 96,522
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 8,899 12,120
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 8,899 12,120
Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets $ 0 $ 0