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Note 14 - Fair Value of Financial Instruments (Details Textual) - USD ($)
12 Months Ended
Sep. 26, 2021
Sep. 27, 2020
Sep. 29, 2019
Mar. 31, 2014
Fair Value Adjustment of Warrants $ 292,000 $ 832,000 $ 612,000  
Senior Secured Notes [Member]        
Debt Instrument, Face Amount $ 482,616,000      
TCT [Member]        
Equity Securities Without Readily Determinable Fair Value, Ownership Percentage of Voting Common Stock 0.70%      
Ownership Percentage of Total Common Stock 8.70%      
Fair Value, Inputs, Level 3 [Member]        
Investments, Fair Value Disclosure, Total $ 4,226,000      
Fair Value, Inputs, Level 3 [Member] | TCT and Private Equity Investment [Member]        
Equity Securities without Readily Determinable Fair Value, Percent 16.70%      
Fair Value, Inputs, Level 2 [Member]        
Warrants and Rights Outstanding $ 71,000 $ 363,000 $ 1,195,000 $ 16,930,000