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Note O - Derivative Financial Instruments (Details Textual) $ in Thousands, € in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Sep. 24, 2021 USD ($)	Dec. 25, 2020 USD ($)	Sep. 25, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 29, 2018 USD ($)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	$ 127,931	$ 130,660		$ 131,624	$ 142,395	$ 140,555	$ 139,958
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	278
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	$ (378)	(678)		$ (610)	$ (925)	$ (1,029)	$ (1,104)
Interest Rate Swap [Member]
Derivative, Number of Instruments Held, Total	1		1
Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Bank of Montreal [Member]
Derivative, Notional Amount	$ 14,500							$ 20,000
Euro Denominated Revolving Loan [Member] \| Net Investment Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative, Notional Amount \| €			€ 6.5
Derivative, Gain (Loss) on Derivative, Net, Total	$ 973	$ 334