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Note 7 - Stock-based Compensation (Details Textual) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2020 | Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  | $ 7.39 | $ 7.96
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  | 10 years |
Share-based Payment Arrangement, Expense |  | $ 13,000 | $ 58,000 | $ 476,000 | $ 496,000
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  | 225,000 |  | $ 225,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 1 year 6 months 25 days |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense |  | 137,000 | $ 124,000 | $ 801,000 | 705,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 1 year 5 months 15 days |
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture, Total |  |  |  | $ 960,000 | $ 763,000
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  | $ 534,000 |  | $ 534,000 |
Restricted Stock Units (RSUs) [Member] | Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 1 year |
Restricted Stock Units (RSUs) [Member] | Employees [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |
The 2015 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) | 750,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  | 790,000 |  | 790,000 |

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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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