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Note 4 - Restructuring Charges - Summary of Restructuring Activities and Associated Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016
Liability, beginning of period |  | $ 270 | $ 735
Restructuring charges, net |  | 164 | 115
Cash payments |  | (434) | (740)
Non-cash charges |  |  | 160
Liability, end of period |  |  | 270
Asset Impairment Charges [Member] |  |  |
Liability, beginning of period |  |  |
Restructuring charges, net |  |  | 20
Cash payments |  |  |
Non-cash charges |  |  | (20)
Liability, end of period |  |  |
Equipment Relocation Costs [Member] |  |  |
Liability, beginning of period |  | 31 |
Restructuring charges, net |  | 164 | 186
Cash payments |  | (195) | (155)
Non-cash charges |  |  |
Liability, end of period |  |  | 31
Employee Severance [Member] |  |  |
Liability, beginning of period |  | 239 | 735
Restructuring charges, net |  |  |
Cash payments |  | (239) | (496)
Non-cash charges |  |  |
Liability, end of period |  |  | 239
Facility Closing [Member] |  |  |
Liability, beginning of period |  |  |
Restructuring charges, net |  |  | 89
Cash payments |  |  | (89)
Non-cash charges |  |  |
Liability, end of period |  |  |
Gain on Sale of Property and Equipment [Member] |  |  |
Liability, beginning of period |  |  |
Restructuring charges, net |  |  | (180)
Cash payments |  |  |
Non-cash charges |  |  | 180
Liability, end of period |  |  |

X
- Definition Amount of non-cash recoveries associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References No definition available. + Details
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X
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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