Note G - Employee Benefit Plans - Fair Values by Asset Category of Defined Benefit Pension Plan (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Fair value by asset category		$ 1,453	$ 1,247	$ 1,571
Fair Value, Inputs, Level 1 [Member]
Fair value by asset category		1,453
Fair Value, Inputs, Level 2 [Member]
Fair value by asset category
Fair Value, Inputs, Level 3 [Member]
Fair value by asset category
Cash and Cash Equivalents [Member]
Fair value by asset category		30
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category		30
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value by asset category
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value by asset category
Commodities and Other [Member]
Fair value by asset category		1
Commodities and Other [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category		1
Commodities and Other [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value by asset category
Commodities and Other [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value by asset category
Equity Securities [Member]
Fair value by asset category	[1]	734
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[1]	734
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value by asset category	[1]
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value by asset category	[1]
Debt Securities [Member]
Fair value by asset category	[2]	688
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[2]	688
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value by asset category	[2]
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value by asset category	[2]

[1] This category is comprised of publicly traded funds, of which 47% are large-cap funds, 27% are mid-cap and small-cap, 16% are developed market funds, 9% are emerging markets equity funds, and 1% are specialty funds.

[2] This category is comprised of publicly traded funds, of which 18% are REITs, 17% are high-yield fixed income funds, 36% are U.S. fixed income funds, 8% are developed market fixed income funds, and 21% are international/emerging markets funds.