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Note 12 - Fair Value Measurements (Details Textual) - USD ($)
Jun. 28, 2020
Sep. 29, 2019
Mar. 31, 2014
Long-term Debt, Total $ 539,290,000 $ 429,391,000  
Fair Value, Inputs, Level 3 [Member]      
Investments, Fair Value Disclosure, Total 6,068,000    
Equity Securities without Readily Determinable Fair Value, Amount 9,610,000    
Fair Value, Inputs, Level 3 [Member] | Senior Secured Notes [Member]      
Long-term Debt, Total $ 576,000,000    
Fair Value, Inputs, Level 3 [Member] | TCT and Private Equity Investment [Member]      
Equity Securities without Readily Determinable Fair Value, Percent 17.00%    
Fair Value, Inputs, Level 2 [Member]      
Warrants and Rights Outstanding $ 430,000 $ 1,195,000 $ 16,930,000