Note H - Employee Benefit Plans - Fair Values by Asset Category of Defined Benefit Pension Plan (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Fair value by asset category		$ 1,025	$ 1,094	$ 1,429
Fair Value, Inputs, Level 1 [Member]
Fair value by asset category		1,025
Fair Value, Inputs, Level 2 [Member]
Fair value by asset category		0
Fair Value, Inputs, Level 3 [Member]
Fair value by asset category		0
Equity Securities [Member]
Fair value by asset category	[1]	653
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[1]	653
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value by asset category	[1]	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value by asset category	[1]	0
Debt Securities [Member]
Fair value by asset category	[2]	141
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[2]	141
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value by asset category	[2]	0
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value by asset category	[2]	0
Other Contract [Member]
Fair value by asset category	[3]	231
Other Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[3]	231
Other Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value by asset category	[3]	0
Other Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value by asset category	[3]	$ 0

[1] This category is comprised of publicly traded funds, of which 50% are large-cap funds, 26% are developed and emerging market funds, 18% are mid-cap funds, and 6% are small-cap funds.

[2] This category is comprised of publicly traded funds, of which 34% are U.S. fixed income funds and 66% are corporate and foreign market fixed income funds.

[3] This category is comprised of commodities and cash alternatives.