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Note 3 - Investments in Associated Companies (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 29, 2020 | Mar. 31, 2019 | Mar. 29, 2020 | Mar. 31, 2019
TNI Partners [Member] |  |  |  |
Proceeds from Equity Method Investment, Distribution | $ 953,000 | $ 1,957,000 | $ 1,691,000 | $ 2,506,000
MNI [Member] |  |  |  |
Proceeds from Equity Method Investment, Distribution | $ 1,000,000 | $ 750,000 | $ 1,000,000 | $ 1,500,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 50.00% |  | 50.00% |

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