Note G - Employee Benefit Plans - Fair Values by Asset Category of Defined Benefit Pension Plan (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Fair value by asset category		$ 1,369	$ 1,453	$ 1,247
Fair Value, Inputs, Level 1 [Member]
Fair value by asset category		1,369
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		105
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category		105
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		25
Commodities and Other [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category		25
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]	712
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[1]	712
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]	527
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[2]	527
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 34% are large-cap funds, 27% are mid-cap and small-cap, 13% are developed market funds, 15% are emerging markets equity funds, and 11% are specialty funds.

[2] This category is comprised of publicly traded funds, of which 16% are REITs, 49% are high-yield fixed income funds, 4% are U.S. fixed income funds, 8% are developed market fixed income funds, and 23% are international/emerging markets funds.