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Note 11 - Commitments and Contingencies (Details Textual) | 12 Months Ended |
--- | --- | ---
Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Oct. 02, 2017 USD ($)
Operating Leases, Rent Expense, Total | $ 1,500,000 | $ 1,800,000 | $ 1,800,000 |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 1,000,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 543,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 185,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 22,000 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter | $ 16,000 |  |  |
Change in Control Agreement [Member] |  |  |  |
Guarantee Obligations Term | 2 years |  |  |
Change in Control Agreement Renewal [Member] |  |  |  |
Guarantee Obligations Term | 1 year |  |  |
Chief Executive Officer and Chief Financial Officer [Member] | Severance Agreement [Member] |  |  |  |
Guarantee Obligations Term | 2 years |  |  |
Ratio of Severance Benefits to Base Compensation | 1.5 |  |  |
Severance Benefits Continuation of Health and Welfare Benefits Term | 1 year 180 days |  |  |
Chief Executive Officer and Chief Financial Officer [Member] | Severance Agreement Renewal [Member] |  |  |  |
Guarantee Obligations Term | 1 year |  |  |
Chief Executive Officer and Chief Financial Officer [Member] | Change in Control Agreement [Member] |  |  |  |
Ratio of Severance Benefits to Base Compensation | 2 |  |  |
Severance Benefits Continuation of Health and Welfare Benefits Term | 2 years |  |  |
Guarantor Obligations Triggering Event Term from Change in Control to Termination | 2 years |  |  |
Ratio of Severance Benefits to the Average Bonus for the Prior Three Years | 2 |  |  |
Key Members of Management [Member] | Change in Control Agreement [Member] |  |  |  |
Ratio of Severance Benefits to Base Compensation | 1 |  |  |
Severance Benefits Continuation of Health and Welfare Benefits Term | 1 year |  |  |
Ratio of Severance Benefits to the Average Bonus for the Prior Three Years | 1 |  |  |
Non-cancelable Purchase Commitment for Raw Material [Member] |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed | $ 75,100,000 |  |  |
Non-cancelable Purchase Commitment Term | 100 days |  |  |
Purchase Commitment for Equipment [Member] |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed | $ 9,600,000 |  |  |
Leased Facility in Houston, Texas [Member] |  |  |  |
Lease Purchase Option Exercised |  |  |  | $ 4,900,000
Fire [Member] |  |  |  |
Insurance Recoveries | 183,000 |  |  |
Insurance Settlements Receivable | 462,000 |  |  |
Fire [Member] | Cost of Sales [Member] |  |  |  |
Insurance Recoveries | 645,000 |  |  |
Storm [Member] |  |  |  |
Insurance Recoveries | 439,000 |  |  |
Insurance Settlements Receivable | 52,000 |  |  |
Storm [Member] | Cost of Sales [Member] |  |  |  |
Insurance Recoveries | 439,000 |  |  |
Storm [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Insurance Recoveries | 26,000 |  |  |
Storm [Member] | Other Income [Member] |  |  |  |
Insurance Recoveries | $ 26,000 |  |  |

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