| Mar 31,
2013 | Mar 31,
2014 | Mar 31,
2015 | Dec 31,
2019 | Dec 31,
2020 | Dec 31,
2021 | Dec 31,
2022 | Dec 31,
2023 |
|---|
| Net sales | 15,580 | 11,731 | 10,187 | 19,043 | 14,610 | 15,219 | 10,714 | 12,358 |
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| Net sales | 15,580 | 11,731 | 10,187 | 19,043 | 14,610 | 15,219 | 10,714 | 12,358 |
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| Cost of sales | 13,582 | 9,404 | 8,017 | 15,275 | 11,880 | 12,822 | 8,506 | 9,683 |
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| Cost of sales | 13,582 | 9,404 | 8,017 | 15,275 | 11,880 | 12,822 | 8,506 | 9,683 |
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| Gross profit (loss) | 1,998 | 2,327 | 2,170 | 3,768 | 2,730 | 2,397 | 2,208 | 2,675 |
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| Packing and transportation costs | 373 | 288 | 273 | - | - | - | - | - |
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| Remuneration for directors (and other officers) | 52 | 52 | 50 | - | - | - | - | - |
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| Provision for bonuses | 23 | 27 | 19 | - | - | - | - | - |
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| Retirement benefit expenses | 11 | 12 | 11 | - | - | - | - | - |
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| Depreciation | 58 | 59 | 58 | 221 | 166 | 66 | 68 | 35 |
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| Commission expenses | - | - | - | 463 | 331 | 269 | 214 | 252 |
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| Research and development expenses | 94 | 108 | 118 | - | - | - | - | - |
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| Provision of allowance for doubtful accounts | -0 | -0 | -0 | - | - | - | - | - |
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| Selling, general and administrative expenses | 1,664 | 1,586 | 1,515 | 3,682 | 3,045 | 2,383 | 2,275 | 2,290 |
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| Selling, general and administrative expenses | 1,664 | 1,586 | 1,515 | 3,682 | 3,045 | 2,383 | 2,275 | 2,290 |
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| Operating profit (loss) | 334 | 741 | 655 | 86 | -315 | 14 | -67 | 385 |
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| Interest income | 0 | 1 | 5 | 0 | 1 | 0 | 1 | 1 |
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| Dividend income | 5 | 5 | 5 | 2 | 1 | 1 | 1 | 0 |
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| Compensation income | - | - | - | - | - | - | 13 | - |
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| Insurance claim income | 41 | 4 | - | - | - | - | - | 7 |
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| Subsidy income | - | - | - | - | 75 | 32 | 1 | 1 |
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| Subsidy income | - | - | - | - | 75 | 32 | 1 | 1 |
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| Other | 11 | 10 | 9 | 14 | 22 | 25 | 12 | 12 |
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| Non-operating income | 101 | 82 | 27 | 19 | 99 | 58 | 28 | 21 |
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| Interest expenses | 5 | 3 | 3 | 24 | 25 | 30 | 26 | 21 |
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| Non-deductible consumption tax | - | - | - | - | - | - | 9 | - |
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| Other | 20 | 0 | 0 | 1 | 7 | 13 | 10 | 4 |
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| Other | 20 | 0 | 0 | 1 | 7 | 13 | 10 | 4 |
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| Non-operating expenses | 178 | 19 | 9 | 30 | 52 | 48 | 45 | 25 |
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| Non-operating expenses | 178 | 19 | 9 | 30 | 52 | 48 | 45 | 25 |
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| Ordinary profit (loss) | 257 | 804 | 672 | 75 | -268 | 24 | -84 | 382 |
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| Gain on sale of non-current assets | - | 1 | - | 0 | - | 387 | - | 0 |
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| Gain on sale of shares of subsidiaries and associates | - | - | - | - | 16 | - | 7 | - |
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| Gain on sale of investment securities | 35 | - | 73 | - | 16 | - | - | 110 |
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| Extraordinary income | 35 | 1 | 73 | 10 | 32 | 387 | 7 | 111 |
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| Gain on sale of shares of subsidiaries and associates | - | - | - | - | 16 | - | 7 | - |
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| Extraordinary income | 35 | 1 | 73 | 10 | 32 | 387 | 7 | 111 |
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| Loss on retirement of non-current assets | - | 2 | 1 | 8 | 1 | 189 | 23 | 17 |
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| Extraordinary losses | 28 | 6 | 257 | 8 | 2,171 | 344 | 23 | 17 |
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| Profit (loss) before income taxes | 264 | 799 | 488 | 76 | -2,407 | 67 | -100 | 476 |
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| Income taxes - current | 55 | 180 | 106 | 31 | 12 | 36 | 9 | 45 |
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| Income taxes - deferred | 2 | -68 | 35 | 175 | -188 | -263 | 81 | -12 |
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| Income taxes | 57 | 112 | 141 | 207 | -176 | -228 | 91 | 33 |
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| Profit (loss) | - | - | - | -130 | -2,231 | 294 | -191 | 443 |
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| Profit (loss) attributable to owners of parent | - | - | - | -130 | -2,085 | 294 | -191 | 443 |
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