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Note 3 - Investments in Associated Companies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
TNI Partners [Member]        
Proceeds from Equity Method Investment, Distribution $ 959,000 $ 731,000 $ 2,650,000 $ 3,328,000
MNI [Member]        
Proceeds from Equity Method Investment, Distribution $ 0 $ 850,000 $ 1,000,000 $ 2,350,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 50.00%   50.00%