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Note 12 - Commitments and Contingencies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017 | Oct. 02, 2017
Operating Leases, Rent Expense, Total | $ 1,600,000 | $ 1,500,000 | $ 1,800,000 |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 1,000,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 666,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 256,000 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 61,000 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 47,000 |  |  |
Non-cancelable Purchase Commitment for Raw Material [Member] |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed | $ 23,800,000 |  |  |
Non-cancelable Purchase Commitment Term | 100 days |  |  |
Purchase Commitment for Equipment [Member] |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed | $ 2,800,000 |  |  |
Leased Facility in Houston, Texas [Member] |  |  |  |
Lease Purchase Option Exercised |  |  |  | $ 4,900,000
Fire [Member] |  |  |  |
Insurance Recoveries | 2,200,000 | 183,000 |  |
Insurance Settlements Receivable |  | 462,000 |  |
Fire [Member] | Other Income [Member] |  |  |  |
Insurance Recoveries | 1,100,000 |  |  |
Fire [Member] | Cost of Sales [Member] |  |  |  |
Insurance Recoveries | 645,000 |  |  |
Fire [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Insurance Recoveries | 48,000 |  |  |
Storm [Member] |  |  |  |
Insurance Recoveries | 150,000 | 439,000 |  |
Insurance Settlements Receivable |  | 52,000 |  |
Storm [Member] | Other Income [Member] |  |  |  |
Insurance Recoveries | $ 98,000 | 26,000 |  |
Storm [Member] | Cost of Sales [Member] |  |  |  |
Insurance Recoveries |  | 439,000 |  |
Storm [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Insurance Recoveries |  | $ 26,000 |  |

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