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Note 16 - Employee Benefit Plans - Asset Allocation (Details)
Jun. 30, 2021
Jun. 30, 2020
UNITED STATES    
Asset allocations 100.00% 100.00%
Foreign Plan [Member]    
Asset allocations 100.00% 100.00%
Equity Securities [Member] | UNITED STATES    
Asset allocations 36.00% 41.00%
Equity Securities [Member] | Foreign Plan [Member]    
Asset allocations 5.00% 5.00%
Debt Securities [Member] | UNITED STATES    
Asset allocations 43.00% 38.00%
Debt Securities [Member] | Foreign Plan [Member]    
Asset allocations 70.00% 64.00%
Hedge Funds, Global Opportunity [Member] | UNITED STATES    
Asset allocations 12.00% 11.00%
Hedge Funds, Global Opportunity [Member] | Foreign Plan [Member]    
Asset allocations 24.00% 29.00%
Other Debt Obligations [Member] | UNITED STATES    
Asset allocations 9.00% 10.00%
Other Debt Obligations [Member] | Foreign Plan [Member]    
Asset allocations 1.00% 2.00%