Note 16 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan, Accumulated Benefit Obligation	$ 283,900	$ 301,600
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	4,500
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	17,600
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	17,400
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	17,200
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	17,700
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	17,800
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	89,300
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 1,400
Defined Contribution Plan Company Stock Held in Plan	157,921
Retirement Savings Plans [Member]
Defined Contribution Plans Number of Plans	2
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 3,700	4,000	$ 4,000
Retirement Savings Plans [Member] | Salaried Employees [Member]
Defined Contribution Plans Number of Plans	1
Defined Contribution Plan Company Stock Held in Plan	68,000
Defined Contribution Plan Company Stock, Percentage of Plan Assets	6.26%
Retirement Savings Plans [Member] | Hourly Employees [Member]
Defined Contribution Plans Number of Plans	1
UNITED STATES
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 5,750	$ 284