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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
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Oct. 03, 2015 | Sep. 27, 2014 | Sep. 28, 2013
Minimum [Member] | Machinery and Equipment [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 3 |  |
Minimum [Member] | Building [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 10 |  |
Minimum [Member] | Land Improvements [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 5 |  |
Maximum [Member] | Machinery and Equipment [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 15 |  |
Maximum [Member] | Building [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 30 |  |
Maximum [Member] | Land Improvements [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 15 |  |
Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
PC Strand Operations [Member] |  |  |
Asset Impairment Charges | $ 300,000 |  |
Interest Costs Capitalized | 0 | $ 0 | $ 0
Asset Impairment Charges | 543,000 | 0 | 0
Goodwill, Impairment Loss | 0 |  |
Depreciation | $ 10,900,000 | $ 9,800,000 | $ 9,700,000
Finite-Lived Intangible Asset, Useful Life |  |  |

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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=51824106&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=56944662&loc=d3e3602-108585 + Details
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