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Note 16 - Employee Benefit Plans - Fair Values of Pension Plans (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Fair value of pension plan assets $ 236,935 $ 225,870
Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 5,161 9,468
Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 231,774 216,402
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 3,113 7,696
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 1,684 439
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 1,429 7,257
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 85,641 86,415
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 1,857 1,866
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 83,784 84,549
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 126,703 97,627
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets 1,620 7,163
Corporate Bonds and Other Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets 125,083 90,464
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 21,478 24,971
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 21,478 24,971
Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets $ 0 0
US Government Agencies Debt Securities [Member]    
Fair value of pension plan assets   9,161
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of pension plan assets   0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of pension plan assets   9,161
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of pension plan assets   $ 0