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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
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Oct. 01, 2016 | Oct. 03, 2015 | Sep. 27, 2014
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 |  |
Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
PC Strand Operations [Member] |  |  |
Asset Impairment Charges | $ 20,000 | $ 300,000 |
Depreciation | 10,400,000 | 10,900,000 | $ 9,800,000
Asset Impairment Charges | 20,000 | 543,000 | 0
Interest Costs Capitalized | 0 | $ 0 | $ 0
Goodwill, Impairment Loss | $ 0 |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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