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Note 11 - Commitments and Contingencies (Details Textual)
 2 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Oct. 01, 2016
USD ($)
Oct. 03, 2015
USD ($)
Oct. 02, 2017
USD ($)
Insurance Recoveries       $ 2,000,000  
Operating Leases, Rent Expense   $ 1,800,000 $ 1,800,000 1,800,000  
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 984,000 984,000      
Operating Leases, Future Minimum Payments, Due in Two Years 498,000 498,000      
Operating Leases, Future Minimum Payments, Due in Three Years 136,000 136,000      
Operating Leases, Future Minimum Payments, Due in Four Years 2,000 2,000      
Operating Leases, Future Minimum Payments, Due Thereafter 1,000 $ 1,000      
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 28,900,000 $ 28,900,000      
Non-cancelable Purchase Commitment Term   100 days      
Purchase Commitment for Equipment [Member]          
Purchase Commitment, Remaining Minimum Amount Committed $ 15,500,000 $ 15,500,000      
Subsequent Event [Member] | Leased Facility in Houston, Texas [Member]          
Lease Purchase Option Exercised         $ 4,900,000
Cost of Sales [Member]          
Insurance Recoveries       244,000  
Selling, General and Administrative Expenses [Member]          
Insurance Recoveries       69,000  
Other Expense [Member]          
CustomerDisputes       $ 700,000  
Texas, Florida [Member]          
Number of Facilities Affected by Hurricanes 4