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Note 16 - Employee Benefit Plans - Asset Allocation (Details)	Jun. 30, 2018	Jun. 30, 2017
UNITED STATES
Asset allocations	100.00%	100.00%
Foreign Plan [Member]
Asset allocations	100.00%	100.00%
Equity Securities [Member] \| UNITED STATES
Asset allocations	33.00%	33.00%
Equity Securities [Member] \| Foreign Plan [Member]
Asset allocations	20.00%	21.00%
Debt Securities [Member] \| UNITED STATES
Asset allocations	33.00%	29.00%
Debt Securities [Member] \| Foreign Plan [Member]
Asset allocations	44.00%	44.00%
Hedge Funds, Global Opportunity [Member] \| UNITED STATES
Asset allocations	24.00%	26.00%
Hedge Funds, Global Opportunity [Member] \| Foreign Plan [Member]
Asset allocations	35.00%	28.00%
Other Debt Obligations [Member] \| UNITED STATES
Asset allocations	10.00%	12.00%
Other Debt Obligations [Member] \| Foreign Plan [Member]
Asset allocations	1.00%	7.00%