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Note 3 - Investments in Associated Companies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
TNI Partners [Member]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 50.00%   50.00%  
TNI Partners [Member]        
Proceeds from Equity Method Investment, Distribution $ 544,000 $ 959,000 $ 3,161,000 $ 2,650,000
MNI [Member]        
Proceeds from Equity Method Investment, Distribution $ 750,000 $ 0 $ 1,900,000 $ 1,000,000