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Note 10 - Long-term Debt (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
Amortization of Debt Issuance Costs |  | $ 17,000 | $ 16,000 | $ 49,000 | $ 48,000
Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 100,000,000.0 |  | 100,000,000.0 |
Line Of Credit Facility, Additional Borrowing Capacity | $ 50,000,000.0 |  |  |  |
Long-term Line of Credit, Total |  | 0 |  | 0 |
Line of Credit Facility, Remaining Borrowing Capacity |  | 94,400,000 |  | 94,400,000 |
Letters of Credit Outstanding, Amount |  | $ 1,500,000 |  | $ 1,500,000 |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  |  | 2.00% |
Fixed Charge Coverage Ratio |  |  |  | 1.0 |
Credit Facility, Liquidity Amount |  |  |  | $ 10,000,000.0 |
Revolving Credit Facility [Member] | Federal Funds Rate [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.50% |
Revolving Credit Facility [Member] | Base Rate [Member] |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 0.25% |  | 0.25% |
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.25% |
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.50% |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 1.25% |  | 1.25% |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.25% |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.50% |

X
- Definition The minimum liquidity amount that would trigger a fixed charge coverage ratio requirement as part of a covenant under a credit facility. + References No definition available. + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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