Note G - Employee Benefits Plans - Defined Benefit Pension Plan's Weighted Average Asset Association and Weighted Average Target Allocation (Details)	12 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Equity Securities [Member]
Weighted-average asset allocation	50.00%	53.00%
Weighted-average target allocation	49.00%
Debt Securities [Member]
Weighted-average asset allocation	47.00%	45.00%
Weighted-average target allocation	46.00%
Commodity Contract [Member]
Weighted-average asset allocation
Weighted-average target allocation	2.00%
Cash and Cash Equivalents [Member]
Weighted-average asset allocation	3.00%	2.00%
Weighted-average target allocation	3.00%
Weighted-average asset allocation	100.00%	100.00%
Weighted-average target allocation	100.00%

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant