Note O - Derivative Financial Instruments - Impact of the Company's Derivative Instruments on the Consolidated Statement of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 26, 2021	Dec. 25, 2020	Sep. 25, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Mar. 26, 2021	Mar. 27, 2020
Interest rate swap	$ 193	$ 104	$ 75	$ (582)	$ 146	$ (143)	$ 372	$ (579)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Interest rate swap	193			(582)			372	(579)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member]
Gain (loss) on derivative instruments	98			37			297	79
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Other Nonoperating Income (Expense) [Member]
Gain (loss) on derivative instruments	$ 0			$ 0			$ (13)	$ 0