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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016
Depreciation, Total | $ 11,600,000 | $ 10,500,000 | $ 10,400,000
Interest Costs Capitalized | 0 | 0 | 0
Goodwill, Impairment Loss | 0 |  |
Asset Impairment Charges, Total | $ 0 | $ 0 | 20,000
Impairment of Long-Lived Assets Held-for-use |  |  | $ 20,000
Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |
Building [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Building [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 30 years |  |
Land Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Land Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |

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