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Note 1 - Nature of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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May 01, 2021
Notes Tables |
Equity Method Investments [Table Text Block] |
|  | Year Ended |
|  | May 1, 2021 |  |  | May 2, 2020 |  |  | April 27, 2019 |
Balance sheet data: |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  | $ | 7,534 |  |  | $ | 10,593 |  |  | $ | 192 |
Non-current assets |  |  | 4,637 |  |  |  | 4,266 |  |  |  | 2,626 |
Current liabilities |  |  | 2,807 |  |  |  | 2,755 |  |  |  | 839 |
Non-current liabilities |  |  | 1,793 |  |  |  | 4,086 |  |  |  | 2,599 |
Income statement data: |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | (13,436 | ) |  |  | (1,383 | ) |  |  | (2,168 | )
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | May 1, 2021 |  |  | May 2, 2020 |  |  | April 27, 2019 |
Cash and cash equivalents |  | $ | 77,590 |  |  | $ | 40,398 |  |  | $ | 35,383 |
Restricted cash |  |  | 2,812 |  |  |  | 14 |  |  |  | 359 |
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows |  | $ | 80,402 |  |  | $ | 40,412 |  |  | $ | 35,742 |
Property, Plant and Equipment, Estimated Useful Life [Table Text Block] |
|  | Years |
Buildings and improvements |  | 5 - 40 |
Machinery and equipment |  | 5 - 7 |
Office furniture and equipment |  | 3 - 5 |
Computer software and hardware |  | 3 - 5 |
Equipment held for rental |  | 2 - 7 |
Demonstration equipment |  | 3 - 5 |
Transportation equipment |  | 5 - 7 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Net income (loss) |  |  | Shares |  |  | Per share income (loss) |
For the year ended May 1, 2021: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 10,926 |  |  |  | 44,989 |  |  | $ | 0.24 |
Dilution associated with stock compensation plans |  |  | — |  |  |  | 213 |  |  |  | — |
Diluted earnings per share |  | $ | 10,926 |  |  |  | 45,202 |  |  | $ | 0.24 |
For the year ended May 2, 2020: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 491 |  |  |  | 45,031 |  |  | $ | 0.01 |
Dilution associated with stock compensation plans |  |  | — |  |  |  | 285 |  |  |  | — |
Diluted earnings per share |  | $ | 491 |  |  |  | 45,316 |  |  | $ | 0.01 |
For the year ended April 27, 2019: |  |  |  |  |  |  |  |  |  |  |  |
Basic loss per share |  | $ | (958 | ) |  |  | 44,926 |  |  | $ | (0.02 | )
Dilution associated with stock compensation plans |  |  | — |  |  |  | — |  |  |  | — |
Diluted loss per share |  | $ | (958 | ) |  |  | 44,926 |  |  | $ | (0.02 | )
Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Allowance |
|  | for Doubtful |
|  | Accounts: |
Balance as of May 2, 2020 |  | $ | 2,828 |
Charged to costs and expenses |  |  | 3,318 |
Deductions (1) |  |  | (2,204 | )
Balance as of May 1, 2021 |  | $ | 3,942 |

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