Note 6 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Oct. 03, 2020	Sep. 28, 2019
Cash equivalents	$ 72,234	$ 37,826
Cash surrender value of life insurance policies	10,584	10,211
Total	82,818	48,037
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	72,234	37,826
Cash surrender value of life insurance policies	0	0
Total	72,234	37,826
Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Cash surrender value of life insurance policies	10,584	10,211
Total	$ 10,584	$ 10,211