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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, 2025
Jun. 30, 2024
Jun. 30, 2023
Fair value by asset category $ 1,042 $ 1,232 $ 1,025
Fair Value, Inputs, Level 1 [Member]      
Fair value by asset category 1,042    
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] 623    
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value by asset category [1] 623    
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] 370    
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value by asset category [2] 370    
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] 49    
Other Contract [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value by asset category [3] 49    
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 74% are U.S. large-cap funds, 20% are U.S. mid-cap funds, and 6% U.S. small-cap funds.
[2] This category is comprised of publicly traded funds, of which 52% are U.S. fixed income funds and 48% are corporate, foreign or emerging market funds.
[3] This category is comprised of publicly traded assets, of which 81% are money market funds and 19% are commodities.