Note 4 - Fair Value Measurements - Fair Value of Financial Assets (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 29, 2024	Sep. 30, 2023
Cash equivalents	$ 98,218	$ 125,805
Cash surrender value of life insurance policies	12,032	10,586
Total	110,250	136,391
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	98,218	125,805
Cash surrender value of life insurance policies	0	0
Total	98,218	125,805
Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Cash surrender value of life insurance policies	12,032	10,586
Total	$ 12,032	$ 10,586