Note M - Pension and Other Postretirement Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Common Stock Held by U.S Pension Plans [Member]
Defined Benefit Plan, Number of Shares of Equity Securities Issued by Employer and Related Parties Included in Plan Assets	98,211	98,211
Defined Benefit Plan, Amount of Employer and Related Party Securities Included in Plan Assets	$ 1,054,800	$ 1,830,700
Defined Benefit Plan, Actual Plan Asset Allocations	1.10%	1.80%
Pension Plan [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 1,467,000
Defined Benefit Plan, Cost of Premium for Health Coverage Plan, Percentage	100.00%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 129,056,000	$ 127,733,000
Defined Benefit Plan, Weighted Average Healthcare Cost, Trend Rate	7.50%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%
Defined Benefit Plan, Percentage of Increase in Assumed HealthCare Cost Trend Rate	1.00%
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	$ 320,000
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	$ 13,000
Defined Benefit Plan, Percentage of Decrease in Assumed Healthcare Cost Trend Rate	1.00%
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	$ 313,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	$ 13,000
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Defined Benefit Plan, Expected Long-term Return on Plan Assets	7.00%
Defined Contribution Plan, Cost Recognized	$ 2,058,000	$ 2,526,000	$ 2,218,000