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Note 4 - Fair Value Measurements - Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Interest rate swaps $ 9,293 $ 10,235
Debt Securities, Available-for-Sale 2,643 2,729
Equity securities 1,982 2,046
Foreign exchange contracts, assets 1,951 1,722
Fair Value, Inputs, Level 1 [Member]    
Interest rate swaps 0 0
Debt Securities, Available-for-Sale 0 0
Equity securities 0 0
Foreign exchange contracts, assets 0 0
Fair Value, Inputs, Level 2 [Member]    
Interest rate swaps 9,293 10,235
Debt Securities, Available-for-Sale 0 0
Equity securities 0 0
Foreign exchange contracts, assets 1,951 1,722
Fair Value, Inputs, Level 3 [Member]    
Interest rate swaps 0 0
Debt Securities, Available-for-Sale 2,643 2,729
Equity securities 1,982 2,046
Foreign exchange contracts, assets 0 0
Deferred Compensation Plan [Member]    
Marketable securities - deferred compensation plan 3,997 3,720
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 1 [Member]    
Marketable securities - deferred compensation plan 3,997 3,720
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 2 [Member]    
Marketable securities - deferred compensation plan 0 0
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 3 [Member]    
Marketable securities - deferred compensation plan $ 0 $ 0