Note H - Employee Benefit Plans - Fair Values by Asset Category of Defined Benefit Pension Plan (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Fair value by asset category		$ 1,094	$ 1,429	$ 1,339
Fair Value, Inputs, Level 1 [Member]
Fair value by asset category		1,094
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]	590
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[1]	590
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]	217
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[2]	217
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]	287
Other Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value by asset category	[3]	287
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 52% are large-cap funds, 24% are developed market funds, 19% are mid-cap funds, and 5% are small-cap funds.

[2] This category is comprised of publicly traded funds, of which 42% are U.S. fixed income funds and 58% are corporate and foreign market fixed income funds.

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