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Note 10 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 24.50% | 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 3,300,000 |
Deferred Tax Liabilities, Net, Noncurrent | $ 6,900,000 | 5,340,000 |
Deferred Tax Assets, Tax Credit Carryforwards, Total | 8,000 |  |
Deferred Tax Assets, Valuation Allowance, Total | 257,000 | 233,000 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 24,000 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | 0 | $ 0 | $ 0
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards, Total | 1,700,000 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards, Total | $ 2,200,000 |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |
Operating Loss Carryforwards Expiration Date 1 | 2022 |  |
State and Local Jurisdiction [Member] | Latest Tax Year [Member] |  |  |
Operating Loss Carryforwards Expiration Date 1 | 2034 |  |
Tax Credit Carryforward, Expiration Date 1 | 2020 |  |

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