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Note R - Derivative Financial Instruments - Impact of the Company's Derivative Instruments on the Consolidated Statement of Operations and Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Unrealized gain (loss) on hedges $ 760 $ (595)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Unrealized Gain (Loss) on Hedges [Member] | Cash Flow Hedging [Member]    
Unrealized gain (loss) on hedges 425 (595)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member]    
Gain (loss) on derivative instruments 399 171
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Other Nonoperating Income (Expense) [Member]    
Gain (loss) on derivative instruments (15) (9)
Euro Denominated Revolving Loan [Member] | Designated as Hedging Instrument [Member] | Unrealized Gain (Loss) on Hedges [Member] | Net Investment Hedging [Member]    
Unrealized gain (loss) on hedges $ 335 $ 0