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Note 13 - Fair Value of Financial Instruments (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018 | Mar. 31, 2014
Fair Value Adjustment of Warrants | $ 832,000 | $ 612,000 | $ 226,000 |
Senior Secured Notes [Member] |  |  |  |
Debt Instrument, Face Amount | $ 538,290,000 |  |  |
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 |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 702,000 |  |  |
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 | $ 363,000 | $ 1,195,000 | $ 1,807,000 | $ 16,930,000

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