Note 10 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands		Sep. 27, 2020	Jun. 28, 2020
Trading securities held in a “rabbi trust”	[1]	$ 16,311	$ 13,442
Total assets (liabilities) at fair value		16,311	13,442
Fair Value, Inputs, Level 1 [Member]
Trading securities held in a “rabbi trust”	[1]	16,311	13,442
Total assets (liabilities) at fair value		16,311	13,442
Fair Value, Inputs, Level 2 [Member]
Trading securities held in a “rabbi trust”	[1]	0	0
Total assets (liabilities) at fair value		0	0
Fair Value, Inputs, Level 3 [Member]
Trading securities held in a “rabbi trust”	[1]	0	0
Total assets (liabilities) at fair value		$ 0	$ 0

[1] The Company has established an NQDC Plan for certain members of senior management. Deferred compensation plan assets are invested in mutual funds held in a “rabbi trust,” which is restricted for payment to participants of the NQDC Plan. Trading securities held in a rabbi trust are measured using quoted market prices at the reporting date and are included in the “Other assets” line item, with the corresponding liability included in the “Other liabilities” line item in the consolidated balance sheets.