Note O - Derivative Financial Instruments (Details Textual) $ in Thousands	3 Months Ended
	Mar. 27, 2020 USD ($)	Dec. 27, 2019 USD ($)	Sep. 27, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 29, 2019 USD ($)	Dec. 28, 2018 USD ($)	Sep. 28, 2018 USD ($)	Jun. 30, 2018 USD ($)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	$ 144,035	$ 169,485	$ 173,363	$ 182,818	$ 186,642	$ 181,843	$ 178,459	$ 143,616
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	362
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	$ (1,088)	$ (506)	$ (652)	$ (509)
Interest Rate Swap [Member]
Derivative, Number of Instruments Held, Total	1
Foreign Exchange Forward [Member]
Derivative, Number of Instruments Held, Total	0			0