Note 10 - Other Retirement Plans (Details Textual) - USD ($)	12 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 29, 2019
Employee Benefits and Share-based Compensation	$ 3,403,000	$ 2,666,000	$ 1,683,000
Multiemployer Plans, Withdrawal Obligation	$ 12,862,000
Percentage of CBA's Expiring in the Next Twelve Months	97.00%
Minimum [Member]
Multiemployer Plans, Withdrawal Obligation, Period (Year)	20 years
Warrants and Other Liabilities [Member]
Multiemployer Plans, Withdrawal Obligation	$ 23,471,000	$ 11,473,000