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Note 8 - Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 27, 2018 | May 28, 2017 | May 29, 2016
Tax at U.S. statutory rate (1) | [1] | $ 4,784 | $ 4,922 | $ (6,963)
State income taxes, net of federal benefit |  | 439 | 307 | (518)
Tax reform |  | (14,350) |  |
Change in valuation allowance |  | (176) | 85 | 6
Tax credit carryforwards |  | (777) | (834) | (156)
Other compensation-related activity |  | 566 | (365) | 173
Domestic manufacturing deduction |  |  | (243) | (307)
Other |  | 151 | 168 | 61
Income tax (benefit) expense |  | $ (9,363) | $ 4,040 | $ (7,704)
[1] | Statutory rate was 29.35% for fiscal year 2018 and 35% for fiscal years 2017 and 2016.

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