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Note 11 - Fair Value of Measurements (Details Textual) - USD ($)
Mar. 28, 2021
Sep. 27, 2020
Mar. 31, 2014
Warrants and Rights Outstanding $ 1,080,000 $ 363,000  
Senior Secured Notes [Member]      
Debt Instrument, Face Amount 498,915,000    
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 17.00%    
Fair Value, Inputs, Level 2 [Member]      
Warrants and Rights Outstanding     $ 16,930,000