Note 11 - Employee Benefit and Retirement Plans (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Maximum [Member] | Equity Securities [Member]
Defined Benefit Plan, Target Plan Asset Allocations		70.00%
Maximum [Member] | Company Stock [Member]
Defined Benefit Plan, Target Plan Asset Allocations		20.00%
Maximum [Member] | Cash and Debt Securities [Member]
Defined Benefit Plan, Target Plan Asset Allocations		60.00%
Maximum [Member]
Fixed Contribution Toward Medical Premium for Retirees 65 and Older		$ 28.50
Minimum [Member] | Equity Securities [Member]
Defined Benefit Plan, Target Plan Asset Allocations		40.00%
Minimum [Member] | Company Stock [Member]
Defined Benefit Plan, Target Plan Asset Allocations		10.00%
Minimum [Member] | Cash and Debt Securities [Member]
Defined Benefit Plan, Target Plan Asset Allocations		30.00%
Minimum [Member]
Fixed Contribution Toward Medical Premium for Retirees 65 and Older		$ 23
US Plan [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return on Assets	5.50%
US Plan [Member]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return on Assets		6.00%	6.00%	6.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.49%	4.29%	4.96%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 3,300,000
UK Plan [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return on Assets	4.80%
UK Plan [Member]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return on Assets		5.45%	5.40%	4.90%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.90%	4.30%	4.70%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 1,100,000
Non-qualified Domestic Pension Plan [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 37,000
Post Retirement Medical and Life Insurance Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.49%	4.29%	4.96%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 441,000
Pension Expense		4,600,000	$ 5,000,000	$ 4,400,000
Defined Contribution Plan, Employer Discretionary Contribution Amount		800,000	1,200,000	$ 1,000,000
Fair Value of the Company's Common Stock		$ 12,500,000	$ 13,200,000