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BUSINESS SEGMENTS (Reconciliation of Revenue and Operating Income) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 02, 2023
Jun. 26, 2022
Jul. 02, 2023
Jun. 26, 2022
Jan. 01, 2023
Segment Reporting Information [Line Items]          
Revenues $ 80,800 $ 74,089 $ 156,116 $ 142,631  
Depreciation 111 152 238 313  
Amortization 1,829 770 3,458 1,508  
Operating income 5,050 4,239 (15,679) 7,055  
Capital expenditures 745 1,480 1,490 3,530  
Total assets 182,438   182,438   $ 194,673
Impairment losses (22,545)   (22,545) 0  
Operating Segments | Real Estate          
Segment Reporting Information [Line Items]          
Revenues 31,071 29,980 59,477 55,896  
Depreciation 33 47 68 95  
Operating income 5,774 4,817 10,464 8,852  
Capital expenditures 21 45 53 53  
Total assets 29,681   29,681   29,302
Operating Segments | Professional          
Segment Reporting Information [Line Items]          
Revenues 49,729 44,109 96,639 86,735  
Depreciation 67 89 143 185  
Amortization 1,549 543 2,911 1,100  
Operating income 3,786 3,817 6,413 7,286  
Capital expenditures 184 26 232 50  
Total assets 125,528   125,528   141,018
Home office          
Segment Reporting Information [Line Items]          
Depreciation 11 16 27 33  
Amortization 280 227 547 408  
Capital expenditures 540 1,409 1,205 3,427  
Total assets 27,229   27,229   $ 24,353
Home office | General and Administrative Expense          
Segment Reporting Information [Line Items]          
Operating income $ (4,510) $ (4,395) $ (10,011) $ (9,083)