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Note H - Employee Benefit Plans - Fair Values by Asset Category of Defined Benefit Pension Plan (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Fair value by asset category $ 1,232 $ 1,025 $ 1,094
Fair Value, Inputs, Level 1 [Member]      
Fair value by asset category 1,232    
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] 889    
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value by asset category [1] 889    
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] 173    
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value by asset category [2] 173    
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    
Cash Equivalents [Member]      
Fair value by asset category [3] 170    
Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value by asset category [3] 170    
Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value by asset category [3] 0    
Cash Equivalents [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 72% are U.S. large-cap funds, 24% emerging market funds, and 4% non-U.S. developed market funds.
[2] This category is comprised of publicly traded funds, of which 77% are U.S. fixed income funds and 23% are corporate fixed income funds.
[3] This category is comprised of money market funds.