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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

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