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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Apr. 29, 2023 | Apr. 30, 2022 | May 01, 2021
Pay vs Performance Disclosure |  |  |
Pay vs Performance Disclosure, Table |
|  |  |  |  |  |  |  |  |  | Value of $100 Investment Based on: |  |  |  |
Fiscal Year |  | Summary Compensation Table Total for PEO |  | Compensation Actually Paid to PEO(4) |  | Average Summary Compensation Table for Non-PEO NEOs(1) |  | Average Compensation Actually Paid to Non-PEO NEOs(1,4) |  | TSR |  | Peer Group TSR(2) |  | Net Income (Thousands) |  | Operating Income(3)
2023 |  | $ | 563,183 |  |  | $ | 669,639 |  |  | 322,089 |  |  | 377,287 |  |  | 43.58 |  |  | 0.02 |  |  | 6,802 |  |  | 21,388 |
2022 |  | 538,673 |  |  | 439,151 |  |  | 309,921 |  |  | 250,296 |  |  | (45.71) |  |  | (11.08) |  |  | 592 |  |  | 4,046 |
2021 |  | 449,838 |  |  | 530,283 |  |  | 267,881 |  |  | 307,723 |  |  | 38.65 |  |  | 63.52 |  |  | 10,926 |  |  | 17,108 |
Company Selected Measure Name | Operating Income |  |
Named Executive Officers, Footnote | The individuals who comprised the Non-PEO NEOs in each of the covered fiscal years were Sheila M. Anderson, Chief Financial Officer and Treasurer; Bradley T. Wiemann, Executive Vice President; Matthew J. Kurtenbach, Vice President of Manufacturing; and Carla S. Gatzke, Vice President of Human Resources and Secretary. |  |
Peer Group Issuers, Footnote | The peer group used in this Pay Versus Performance table is the Nasdaq Composite-Total Return. We selected this Index of companies with similar market capitalization because we are unable to identify a peer group of companies similar to us in size and scope of business activities or a widely recognized published industry index that accurately reflects our diverse business activities. Most our direct competitors in our various business units are either privately owned or divisions of larger, publicly owned companies. |  |
PEO Total Compensation Amount | $ 563,183 | $ 538,673 | $ 449,838
PEO Actually Paid Compensation Amount | $ 669,639 | 439,151 | 530,283
Adjustment To PEO Compensation, Footnote |
Adjustments to Determine Compensation "Actually Paid" for PEO |  | 2023 |  | 2022 |  | 2021
Deduction for amounts reported under the "Stock Awards" column in the SCT |  | $ | (16,308) |  |  | $ | (28,296) |  |  | $ | (20,520) |
Deduction for amounts reported under the "Option Awards" columns in the SCT |  | (35,039) |  |  | (30,375) |  |  | (42,660) |
Increase for fair value of awards granted during fiscal year that remain unvested as of year end |  | 98,952 |  |  | 31,320 |  |  | 108,540 |
Increase for fair value of awards granted during fiscal year that vest during year |  | 0 |  |  | 0 |  |  | 0 |
Increase/deduction for change in fair value from prior year-end to current year-end of awards granted prior to year that were outstanding and unvested as of year-end |  | 46,934 |  |  | (75,647) |  |  | 41,542 |
Increase/deduction for change in fair value from prior year-end to vesting date of awards granted prior to year that vested during the year |  | 11,917 |  |  | 3,476 |  |  | (6,457) |
Deduction of fair value of awards granted prior to year that were forfeited during year |  | 0 |  |  | 0 |  |  | 0 |
Increase based upon incremental fair value of awards modified during year |  | 0 |  |  | 0 |  |  | 0 |
Increase based on dividends or other earnings paid during year prior to vesting date of award |  | 0 |  |  | 0 |  |  | 0 |
Total Adjustments |  | $ | 106,456 |  |  | $ | (99,522) |  |  | $ | 80,445 |
Non-PEO NEO Average Total Compensation Amount | $ 322,089 | 309,921 | 267,881
Non-PEO NEO Average Compensation Actually Paid Amount | $ 377,287 | 250,296 | 307,723
Adjustment to Non-PEO NEO Compensation Footnote |
Adjustments to Determine Compensation "Actually Paid" for Non-PEO NEOs |  | 2023 |  | 2022 |  | 2021
Deduction for amounts reported under the "Stock Awards" column in the SCT |  | $ | (7,550) |  |  | $ | (13,100) |  |  | $ | (9,500) |
Deduction for amounts reported under the "Option Awards" columns in the SCT |  | (16,313) |  |  | (14,063) |  |  | (19,750) |
Increase for fair value of awards granted during fiscal year that remain unvested as of year end |  | 46,000 |  |  | 14,500 |  |  | 50,250 |
Increase for fair value of awards granted during fiscal year that vest during year |  | 0 |  |  | 0 |  |  | 0 |
Increase/deduction for change in fair value from prior year-end to current year-end of awards granted prior to year that were outstanding and unvested as of year-end |  | 27,498 |  |  | (45,329) |  |  | 21,925 |
Increase/deduction for change in fair value from prior year-end to vesting date of awards granted prior to year that vested during the year |  | 5,563 |  |  | (1,633) |  |  | (3,083) |
Deduction of fair value of awards granted prior to year that were forfeited during year |  | 0 |  |  | 0 |  |  | 0 |
Increase based upon incremental fair value of awards modified during year |  | 0 |  |  | 0 |  |  | 0 |
Increase based on dividends or other earnings paid during year prior to vesting date of award |  | 0 |  |  | 0 |  |  | 0 |
Total Adjustments |  | $ | 55,198 |  |  | $ | (59,625) |  |  | $ | 39,842 |
Compensation Actually Paid vs. Total Shareholder Return |  |  |
Compensation Actually Paid vs. Net Income |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |
Total Shareholder Return Vs Peer Group | The chart below presents a graphical comparison of the Company's TSR to the Peer Group TSR for the three fiscal years covered by the Pay Versus Performance table. |  |
Total Shareholder Return Amount | $ 43.58 | (45.71) | 38.65
Peer Group Total Shareholder Return Amount | 0.02 | (11.08) | 63.52
Net Income (Loss) | $ 6,802,000 | $ 592,000 | $ 10,926,000
Company Selected Measure Amount | 21,388,000 | 4,046,000 | 17,108,000
Additional 402(v) Disclosure | Our Company-selected measure, which is the measure we believe represents the most important financial performance not otherwise presented in the table above that we use to link compensation actually paid to our PEO and Non-PEO NEOs for fiscal 2023 to our performance, is operating income. SEC rules require certain adjustments be made to the Summary Compensation Table ("SCT") totals to determine "compensation actually paid" ("CAP") as reported in the Pay Versus Performance Table. "CAP" does not necessarily represent cash and/or equity value transferred to the applicable NEO without restriction, but rather is a value calculated under applicable SEC rules. In general, CAP is calculated as SCT total compensation adjusted to include the fair market value of equity awards as of the last day of the applicable fiscal year or, if earlier, the vetsing date (rather than the grant date). The tables below set forth the amounts deducted from and added to the SCT total compensation amounts to calculate CAP for our PEO and average CAP to the Non-PEO NEOs. |  |
PEO | Stock Awards Adjustments [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | $ (16,308) | $ (28,296) | $ (20,520)
PEO | Option Awards Deduction [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | (35,039) | (30,375) | (42,660)
PEO | Equity Awards Granted During the Year, Unvested [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 98,952 | 31,320 | 108,540
PEO | Equity Awards Granted During the Year, Vested [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 | 0
PEO | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 46,934 | (75,647) | 41,542
PEO | Equity Awards Granted in Prior Years, Vested [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 11,917 | 3,476 | (6,457)
PEO | Equity Awards that Failed to Meet Vesting Conditions [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 | 0
PEO | Equity Awards, Incremental Award Modified [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 | 0
PEO | Equity Awards, Value of Dividends and Other Earnings Paid Adjustment [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 | 0
PEO | Equity Award Adjustments [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | 106,456 | (99,522) | 80,445
Non-PEO NEO | Stock Awards Adjustments [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | (7,550) | (13,100) | (9,500)
Non-PEO NEO | Option Awards Deduction [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | (16,313) | (14,063) | (19,750)
Non-PEO NEO | Equity Awards Granted During the Year, Unvested [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 46,000 | 14,500 | 50,250
Non-PEO NEO | Equity Awards Granted During the Year, Vested [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 | 0
Non-PEO NEO | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 27,498 | (45,329) | 21,925
Non-PEO NEO | Equity Awards Granted in Prior Years, Vested [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 5,563 | (1,633) | (3,083)
Non-PEO NEO | Equity Awards that Failed to Meet Vesting Conditions [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 | 0
Non-PEO NEO | Equity Awards, Incremental Award Modified [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 | 0
Non-PEO NEO | Equity Awards, Value of Dividends and Other Earnings Paid Adjustment [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 | 0
Non-PEO NEO | Equity Award Adjustments [Member] |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | $ 55,198 | $ (59,625) | $ 39,842

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