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v3.21.2

Significant Accounting Policies and Disclosures - Additional Information (Details) | 12 Months Ended
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May 29, 2021 USD ($) Number $ / shares shares | May 30, 2020 USD ($) $ / shares shares | Jun. 01, 2019 USD ($) $ / shares shares
Allowance for doubtful accounts | $ 202,000 | $ 334,000 |
Foreign exchange (gain) loss | 759,000 | (15,000) | $ 84,000
Finished goods | 57,000,000.0 | 51,800,000 |
Raw material | 3,900,000 | 3,600,000 |
Work in progress | 2,600,000 | 2,100,000 |
Inventory valuation reserves | 5,900,000 | 5,400,000 |
Inventory provisions | 1,041,000 | 1,013,000 | 1,076,000
Investments - current | 0 | 16,000,000 |
Depreciation | 3,200,000 | 3,100,000 | 2,900,000
Construction in progress | 1,429,000 | 750,000 |
Other non-current liabilities | 1,366,000 | 777,000 |
Share-based compensation expense | $ 675,000 | $ 683,000 | $ 697,000
Stock option vesting period | 5 years |  |
Option terms to exercise | 10 years |  |
Exercised | shares | 48,825 |  |
Proceeds from share exercised | $ 300,000 |  |
Intrinsic value | $ 100,000 |  |
Weighted average fair value of stock option grants | $ / shares | $ 0.49 | $ 0.81 | $ 1.71
Total unrecognized compensation costs | $ 800,000 |  |
Total grant date fair value stock options vested | $ 200,000 |  |
Limit of cash dividends Class B common stock (percent) | 90.00% |  |
Common stock options anti-dilutive | shares | 0 | 1,120,000 | 882,000
Common Stock |  |  |
Common stock shares, authorized | shares | 17,000,000 |  |
Common Class B |  |  |
Common stock shares, authorized | shares | 3,000,000 |  |
Number of votes per share | Number | 10 |  |
Employees' 2011 Long-Term Incentive Compensation Plan |  |  |
Number of shares authorized | shares | 3,500,000 |  |
Number of shares for future issuance | shares | 1,558,000 |  |
Option exercisable period | 5 years |  |
Healthcare |  |  |
Construction in progress | $ 800,000 |  |
Maximum |  |  |
Services revenue recognized as percentage of aggregate revenue | 5.00% |  |
Foreign exchange (gain) loss |  |  | $ 100,000
Intrinsic value |  | $ 100,000 | $ 100,000
Period of recognition | 4 years |  |
Maximum | Employees' 2011 Long-Term Incentive Compensation Plan |  |  |
Option terms to exercise | 10 years |  |
Minimum |  |  |
Period of recognition | 2 years |  |

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