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Note 3 - Investments in Associated Companies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 24, 2018
Jun. 30, 2019
Jun. 24, 2018
MNI [Member]        
Proceeds from Equity Method Investment, Distribution $ 850,000 $ 500,000 $ 2,350,000 $ 2,500,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 50.00%   50.00%  
TNI Partners [Member]        
Proceeds from Equity Method Investment, Distribution $ 731,000 $ 1,177,000 $ 3,238,000 $ 4,375,000