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Note 12 - Fair Value Measurements (Details Textual) - USD ($)
Mar. 29, 2020
Dec. 29, 2019
Sep. 29, 2019
Mar. 31, 2014
Long-term Debt, Total $ 576,000,000   $ 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 9,613,000      
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 $ 158,000 $ 178,000   $ 16,930,000