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DISCONTINUED OPERATIONS - Financial Results of Instaff (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2021 | Sep. 26, 2021 | Jun. 27, 2021 | Mar. 28, 2021 | Dec. 27, 2020 | Sep. 27, 2020 | Jun. 28, 2020 | Mar. 29, 2020 | Dec. 26, 2021 | Dec. 27, 2020 | Dec. 29, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations, net of tax | $ 990,482 | $ 930,129 | $ 807,612 | $ 923,380 | $ 1,125,219 | $ 938,050 | $ 641,525 | $ 808,561 | $ 3,651,603 | $ 3,513,355 | $ 3,606,159
Instaff | Discontinued Operations, Held-for-sale |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 71,292,000 | 70,765,000 | 74,549,000
Cost of services |  |  |  |  |  |  |  |  | 60,948,000 | 60,585,000 | 63,694,000
Gross profit |  |  |  |  |  |  |  |  | 10,344,000 | 10,180,000 | 10,855,000
Selling expenses |  |  |  |  |  |  |  |  | 5,684,000 | 5,315,000 | 5,977,000
Depreciation |  |  |  |  |  |  |  |  | 90,000 | 99,000 | 102,000
Income from operations of discontinued operations before taxes |  |  |  |  |  |  |  |  | 4,570,000 | 4,766,000 | 4,776,000
Income taxes |  |  |  |  |  |  |  |  | (918,000) | (1,253,000) | (1,170,000)
Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  | $ 3,652,000 | $ 3,513,000 | $ 3,606,000

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