Note 5 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Apr. 03, 2021	Oct. 03, 2020
Cash equivalents	$ 90,247	$ 72,234
Cash surrender value of life insurance policies	12,401	10,584
Total	102,648	82,818
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	90,247	72,234
Cash surrender value of life insurance policies	0	0
Total	90,247	72,234
Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Cash surrender value of life insurance policies	12,401	10,584
Total	$ 12,401	$ 10,584