Note O - Derivative Financial Instruments (Details Textual) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 26, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 25, 2020 USD ($)	Sep. 25, 2020 USD ($)	Mar. 27, 2020 USD ($)	Dec. 27, 2019 USD ($)	Sep. 27, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 29, 2018 USD ($)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	$ 140,853	$ 139,958	$ 142,395	$ 140,555	$ 144,035	$ 169,485	$ 173,363	$ 182,818
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	359
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	$ (732)	$ (1,104)	$ (925)	$ (1,029)	$ (1,088)	$ (506)	$ (652)	$ (509)
Interest Rate Swap [Member]
Derivative, Number of Instruments Held, Total	1
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Bank of Montreal [Member]
Derivative, Notional Amount	$ 16,500								$ 20,000
Foreign Exchange Forward [Member]
Derivative, Number of Instruments Held, Total	0	1
Derivative, Notional Amount		$ 1,247
Derivative, Average Remaining Maturity (Day)		7 days
Derivative, Loss on Derivative		$ 9