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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2022 | May 01, 2021 | May 02, 2020 | Apr. 30, 2020 | Apr. 27, 2019
Unrecognized Tax Benefits, Ending Balance | $ 2,079 | $ 2,055 | $ 1,974 | $ 2,100 | $ 1,868
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | 8 |  |  |  |
Changes in Income Tax if All Uncertain Tax Positions Prevail | 1,900 |  |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 248 |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease), Total | $ (10) |  |  |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |
Open Tax Year | 2016 2017 2018 2019 2020 2021 |  |  |  |

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