Note 17 - Employee Benefit Plans - Asset Allocation (Details)	Jun. 30, 2019	Jun. 30, 2018
UNITED STATES
Asset allocations	100.00%	100.00%
Foreign Plan [Member]
Asset allocations	100.00%	100.00%
Equity Securities [Member] | UNITED STATES
Asset allocations	31.00%	33.00%
Equity Securities [Member] | Foreign Plan [Member]
Asset allocations	20.00%	20.00%
Debt Securities [Member] | UNITED STATES
Asset allocations	35.00%	33.00%
Debt Securities [Member] | Foreign Plan [Member]
Asset allocations	41.00%	44.00%
Hedge Funds, Global Opportunity [Member] | UNITED STATES
Asset allocations	24.00%	24.00%
Hedge Funds, Global Opportunity [Member] | Foreign Plan [Member]
Asset allocations	37.00%	35.00%
Other Debt Obligations [Member] | UNITED STATES
Asset allocations	10.00%	10.00%
Other Debt Obligations [Member] | Foreign Plan [Member]
Asset allocations	2.00%	1.00%