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BUSINESS SEGMENT AND INTERNATIONAL OPERATION INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Segment information |  |
Net sales | $ 454,364 | $ 445,320
Cost of sales | 129,676 | 124,193
Volume incentives | 140,589 | 135,320
Selling, general and administrative | 164,004 | 167,058
Operating income | 20,095 | 18,749
Interest and other income, net | 177 | 552
Interest expense | (146) | (69)
Foreign exchange gains, net | (1,700) | 970
Income from operations before provision for income taxes | 18,426 | 20,202
Depreciation and amortization: |  |
Total depreciation and amortization | 14,219 | 11,816
Property, Plant and Equipment [Abstract] |  |
Property, Plant and Equipment, Net | 39,585 | 45,000
Operating Segments |  |
Segment information |  |
Net sales | 454,364 | 445,320
Operating income | 70,987 | 70,245
Depreciation and amortization: |  |
Total depreciation and amortization | 14,219 | 11,816
Unallocated corporate selling, general and administrative expense |  |
Segment information |  |
Selling, general and administrative | (50,892) | (51,496)
General health | Operating Segments |  |
Segment information |  |
Net sales | 183,882 | 173,774
Immunity | Operating Segments |  |
Segment information |  |
Net sales | 38,724 | 32,469
Cardiovascular | Operating Segments |  |
Segment information |  |
Net sales | 81,700 | 83,591
Digestive | Operating Segments |  |
Segment information |  |
Net sales | 111,744 | 103,866
Personal care | Operating Segments |  |
Segment information |  |
Net sales | 17,803 | 18,301
Weight management | Operating Segments |  |
Segment information |  |
Net sales | 20,511 | 33,319
Asia | Operating Segments |  |
Segment information |  |
Net sales | 207,794 | 201,251
Cost of sales | 48,557 | 45,373
Volume incentives | 69,685 | 65,143
Selling, general and administrative | 55,443 | 60,185
Operating income | 34,109 | 30,550
Depreciation and amortization: |  |
Total depreciation and amortization | 1,876 | 1,812
Asia | General health | Operating Segments |  |
Segment information |  |
Net sales | 81,313 | 69,037
Asia | Immunity | Operating Segments |  |
Segment information |  |
Net sales | 12,052 | 5,420
Asia | Cardiovascular | Operating Segments |  |
Segment information |  |
Net sales | 56,266 | 57,771
Asia | Digestive | Operating Segments |  |
Segment information |  |
Net sales | 38,958 | 36,434
Asia | Personal care | Operating Segments |  |
Segment information |  |
Net sales | 5,032 | 5,586
Asia | Weight management | Operating Segments |  |
Segment information |  |
Net sales | 14,173 | 27,003
Europe | Operating Segments |  |
Segment information |  |
Net sales | 84,837 | 81,101
Cost of sales | 27,836 | 25,397
Volume incentives | 33,758 | 33,486
Selling, general and administrative | 18,577 | 18,434
Operating income | 4,666 | 3,784
Depreciation and amortization: |  |
Total depreciation and amortization | 93 | 54
Europe | General health | Operating Segments |  |
Segment information |  |
Net sales | 36,631 | 34,709
Europe | Immunity | Operating Segments |  |
Segment information |  |
Net sales | 8,454 | 8,222
Europe | Cardiovascular | Operating Segments |  |
Segment information |  |
Net sales | 9,265 | 9,143
Europe | Digestive | Operating Segments |  |
Segment information |  |
Net sales | 22,748 | 22,111
Europe | Personal care | Operating Segments |  |
Segment information |  |
Net sales | 5,397 | 4,977
Europe | Weight management | Operating Segments |  |
Segment information |  |
Net sales | 2,342 | 1,939
North America | Operating Segments |  |
Segment information |  |
Net sales | 138,849 | 139,804
Cost of sales | 45,364 | 45,347
Volume incentives | 29,773 | 29,392
Selling, general and administrative | 32,793 | 30,655
Operating income | 30,919 | 34,410
Depreciation and amortization: |  |
Total depreciation and amortization | 12,204 | 9,890
North America | General health | Operating Segments |  |
Segment information |  |
Net sales | 59,520 | 63,742
North America | Immunity | Operating Segments |  |
Segment information |  |
Net sales | 15,802 | 16,124
North America | Cardiovascular | Operating Segments |  |
Segment information |  |
Net sales | 14,443 | 14,959
North America | Digestive | Operating Segments |  |
Segment information |  |
Net sales | 39,325 | 34,628
North America | Personal care | Operating Segments |  |
Segment information |  |
Net sales | 6,241 | 6,476
North America | Weight management | Operating Segments |  |
Segment information |  |
Net sales | 3,518 | 3,875
Latin America and Other | Operating Segments |  |
Segment information |  |
Net sales | 22,884 | 23,164
Cost of sales | 7,918 | 8,076
Volume incentives | 7,374 | 7,299
Selling, general and administrative | 6,299 | 6,288
Operating income | 1,293 | 1,501
Depreciation and amortization: |  |
Total depreciation and amortization | 46 | 60
Latin America and Other | General health | Operating Segments |  |
Segment information |  |
Net sales | 6,418 | 6,286
Latin America and Other | Immunity | Operating Segments |  |
Segment information |  |
Net sales | 2,416 | 2,703
Latin America and Other | Cardiovascular | Operating Segments |  |
Segment information |  |
Net sales | 1,726 | 1,718
Latin America and Other | Digestive | Operating Segments |  |
Segment information |  |
Net sales | 10,713 | 10,693
Latin America and Other | Personal care | Operating Segments |  |
Segment information |  |
Net sales | 1,133 | 1,262
Latin America and Other | Weight management | Operating Segments |  |
Segment information |  |
Net sales | 478 | 502
China |  |
Segment information |  |
Selling, general and administrative | 14,500 | 16,600
United States |  |
Segment information |  |
Net sales | 127,924 | 129,305
Property, Plant and Equipment [Abstract] |  |
Property, Plant and Equipment, Net | 34,786 | 41,239
Taiwan |  |
Segment information |  |
Net sales | 70,579 | 61,691
South Korea |  |
Segment information |  |
Net sales | 51,362 | 49,845
Other |  |
Segment information |  |
Net sales | 204,499 | 204,479
Property, Plant and Equipment [Abstract] |  |
Property, Plant and Equipment, Net | $ 4,799 | $ 3,761

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