Note M - Net Funded Status of Pension and Postretirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Pension Plan [Member]
Benefit obligation, beginning of year	$ 127,733	$ 123,832
Service cost	770	465	$ 536
Interest cost	4,968	4,862	5,425
Actuarial loss (gain)	7,043	8,384
Contributions by plan participants	143	154
Benefits paid	(11,601)	(9,964)
Benefit obligation, end of year	129,056	127,733	123,832
Fair value of assets, beginning of year	104,681	102,495
Actual return on plan assets	(1,442)	5,828
Employer contribution	2,383	6,168
Contributions by plan participants	143	154
Benefits paid	(11,601)	(9,964)
Fair value of assets, end of year	94,164	104,681	102,495
Funded status	(34,892)	(23,052)
Amounts recognized in the balance sheet consist of:
Other assets - noncurrent	654	638
Accrued liabilities - current	(805)	(764)
Accrued retirement benefits - noncurrent	(34,741)	(22,926)
Net amount recognized	(34,892)	(23,052)
Amounts recognized in accumulated other comprehensive loss consist of (net of tax):
Net transition obligation	285	296
Actuarial net loss	45,850	38,613
Net amount recognized	46,135	38,909
Other Postretirement Benefit Plan [Member]
Benefit obligation, beginning of year	16,372	16,584
Service cost	28	30	37
Interest cost	604	579	659
Actuarial loss (gain)	496	882
Contributions by plan participants	519	547
Benefits paid	(2,086)	(2,250)
Benefit obligation, end of year	15,933	16,372	16,584
Fair value of assets, beginning of year
Actual return on plan assets
Employer contribution	1,567	1,703
Contributions by plan participants	519	547
Benefits paid	(2,086)	(2,250)
Fair value of assets, end of year
Funded status	(15,933)	(16,372)
Amounts recognized in the balance sheet consist of:
Other assets - noncurrent
Accrued liabilities - current	(1,969)	(2,040)
Accrued retirement benefits - noncurrent	(13,964)	(14,332)
Net amount recognized	(15,933)	(16,372)
Amounts recognized in accumulated other comprehensive loss consist of (net of tax):
Net transition obligation
Actuarial net loss	3,166	3,312
Net amount recognized	3,166	3,312
Fair value of assets, beginning of year	104,681
Fair value of assets, end of year	94,164	104,681
Net amount recognized	$ 49,301	$ 42,221