| Dec 31,
2018 | Dec 31,
2019 | Dec 31,
2020 | Dec 31,
2021 | Dec 31,
2022 | Dec 31,
2023 |
|---|
| Cash and deposits | - | 586 | 881 | 1,753 | 1,453 | 1,526 |
|---|
| Accounts receivable - trade | - | 327 | 319 | 369 | 358 | 413 |
|---|
| Advance payments to suppliers | - | 48 | 125 | 301 | 600 | 991 |
|---|
| Income taxes refund receivable | - | - | - | - | 28 | 1 |
|---|
| Other | - | 87 | 106 | 113 | 136 | 264 |
|---|
| Current assets | - | 1,048 | 1,432 | 2,536 | 2,575 | 3,194 |
|---|
| Income taxes refund receivable | - | - | - | - | 28 | 1 |
|---|
| Other | - | 87 | 106 | 113 | 136 | 264 |
|---|
| Current assets | - | 1,048 | 1,432 | 2,536 | 2,575 | 3,194 |
|---|
| Facilities attached to buildings | - | 36 | 36 | 37 | 43 | 47 |
|---|
| Accumulated depreciation | - | -3 | -11 | -19 | -32 | -35 |
|---|
| Facilities attached to buildings, net | - | 33 | 24 | 18 | 12 | 12 |
|---|
| Vehicles | - | 7 | 7 | 7 | 7 | 7 |
|---|
| Accumulated depreciation | - | -2 | -4 | -5 | -6 | -6 |
|---|
| Vehicles, net | - | 5 | 3 | 2 | 1 | 1 |
|---|
| Furniture and fixtures | - | 8 | 8 | 4 | 7 | 13 |
|---|
| Accumulated depreciation | - | -5 | -6 | -3 | -3 | -7 |
|---|
| Furniture and fixtures, net | - | 2 | 2 | 1 | 4 | 6 |
|---|
| Property, plant and equipment | - | 40 | 29 | 21 | 17 | 19 |
|---|
| Intangible assets | - | 31 | 43 | 87 | 131 | 188 |
|---|
| Intangible assets | - | 31 | 43 | 87 | 131 | 188 |
|---|
| Investment securities | - | - | - | - | 107 | 2 |
|---|
| Long-term loans receivable from shareholders, directors (and other officers) or employees | - | - | - | - | - | 20 |
|---|
| Deferred tax assets | - | 9 | 11 | 11 | 8 | 45 |
|---|
| Long-term loans receivable from shareholders, directors (and other officers) or employees | - | - | - | - | - | 20 |
|---|
| Leasehold and guarantee deposits | - | 113 | 184 | 338 | 504 | 743 |
|---|
| Other | - | 27 | 38 | 60 | 118 | 185 |
|---|
| Deferred tax assets | - | 9 | 11 | 11 | 8 | 45 |
|---|
| Investments and other assets | - | 149 | 232 | 408 | 737 | 995 |
|---|
| Other | - | 27 | 38 | 60 | 118 | 185 |
|---|
| Investments and other assets | - | 149 | 232 | 408 | 737 | 995 |
|---|
| Non-current assets | - | 220 | 304 | 516 | 885 | 1,203 |
|---|
| Assets | - | 1,268 | 1,736 | 3,052 | 3,460 | 4,396 |
|---|
| Accounts payable - trade | - | 269 | 214 | 235 | 164 | 205 |
|---|
| Accounts payable - other | - | 94 | 91 | 120 | 120 | 115 |
|---|
| Accrued expenses | - | 69 | 83 | 84 | 92 | 109 |
|---|
| Income taxes payable | - | 64 | 55 | 78 | 6 | 74 |
|---|
| Advances received | - | 40 | 115 | 286 | 562 | 960 |
|---|
| Other | - | 64 | 96 | 78 | 71 | 95 |
|---|
| Current liabilities | - | 604 | 655 | 880 | 1,016 | 1,558 |
|---|
| Asset retirement obligations | - | 4 | 4 | 4 | 7 | 7 |
|---|
| Deferred tax liabilities | - | - | - | - | 0 | - |
|---|
| Other | - | 22 | 61 | 144 | 10 | 7 |
|---|
| Asset retirement obligations | - | 4 | 4 | 4 | 7 | 7 |
|---|
| Non-current liabilities | - | 58 | 153 | 336 | 552 | 944 |
|---|
| lease and guarantee deposited | - | 32 | 88 | 189 | 245 | 380 |
|---|
| Long-term deposits received | - | - | - | 133 | 290 | 549 |
|---|
| Other | - | 22 | 61 | 144 | 10 | 7 |
|---|
| Non-current liabilities | - | 58 | 153 | 336 | 552 | 944 |
|---|
| Liabilities | - | 661 | 808 | 1,216 | 1,568 | 2,502 |
|---|
| Share capital | - | 50 | 86 | 420 | 424 | 425 |
|---|
| Capital surplus | - | 41 | 91 | 425 | 429 | 430 |
|---|
| Capital surplus | - | 41 | 91 | 425 | 429 | 430 |
|---|
| Retained earnings | - | 525 | 751 | 990 | 1,038 | 1,142 |
|---|
| Retained earnings | - | 525 | 751 | 990 | 1,038 | 1,142 |
|---|
| Treasury shares | - | -10 | - | - | - | -104 |
|---|
| Shareholders' equity | - | 606 | 928 | 1,835 | 1,892 | 1,894 |
|---|
| Share acquisition rights | - | 1 | 1 | 1 | 1 | 1 |
|---|
| Net assets | 474 | 607 | 929 | 1,836 | 1,893 | 1,894 |
|---|
| Liabilities and net assets | - | 1,268 | 1,736 | 3,052 | 3,460 | 4,396 |
|---|