Summary of significant accounting policies (Details) |
12 Months Ended | ||
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Mar. 31, 2026
USD ($)
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Mar. 31, 2025
USD ($)
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Mar. 31, 2026
CNY (¥)
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| Summary of significant accounting policies (Details) [Line Items] | |||
| Liquid investment instruments original maturity duration | 3 months | ||
| Cash and cash equivalents | $ 415,259 | $ 359,043 | |
| Depositor | 72,485 | ¥ 500,000 | |
| Impairment of long-lived assets | $ 0 | 0 | |
| Current liabilities payment due duration | 1 year | ||
| Deferred offering cost | $ 541,274 | 0 | |
| Related party transactions immediate family hold percent | 10.00% | ||
| Employee benefit expenses | $ 48,111 | 45,754 | |
| Statutory surplus reserve fund description | Pursuant to the laws applicable to the PRC, PRC entities must make appropriations from after-tax profit to the non-distributable “statutory surplus reserve fund.” Subject to certain cumulative limits, the “statutory surplus reserve fund” requires annual appropriations of 10% of after-tax profit until the aggregated appropriations reach 50% of the registered capital. For foreign invested enterprises and joint ventures in the PRC, annual appropriations should be made to the “reserve fund.” For foreign invested enterprises, the annual appropriation for the “reserve fund” cannot be less than 10% of after-tax profits until the aggregated appropriations reach 50% of the registered capital. If the Company has accumulated loss from prior periods, the Company is able to use the current period net income after tax to offset against the accumulate loss. | ||
| Value added tax rates range percent | 13.00% | ||
| VAT tax authorities duration | 5 years | ||
| PRC tax administration and collection law, the statute of limitations duration | 3 years | ||
| PRC tax administration and collection law, statute of limitations extended duration | 5 years | ||
| Cash | $ 415,259 | $ 359,043 | |
| Chromarie International Ltd. [Member] | |||
| Summary of significant accounting policies (Details) [Line Items] | |||
| Subsidiary ownership percentage | 50.00% | 50.00% | |
| Henan Lingbao New Materials Technology Co., Ltd. [Member] | |||
| Summary of significant accounting policies (Details) [Line Items] | |||
| Non-controlling equity interest percent | 1.00% | 1.00% | 1.00% |
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- Definition Current liabilities payment due duration. No definition available.
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- Definition Liquid investment instruments original maturity duration. No definition available.
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- Definition PRC tax administration and collection law, the statute of limitations duration. No definition available.
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- Definition PRC tax administration and collection law, statute of limitations extended duration. No definition available.
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- Definition Related party transactions immediate family hold percent. No definition available.
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- Definition Statutory surplus reserve fund description. No definition available.
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- References No definition available.
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- Definition VAT tax authorities duration. No definition available.
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- Definition Value added tax rates range percent. No definition available.
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- Definition Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of impairment loss for long-lived asset held and used. Includes, but is not limited to, impairment loss for long-lived asset to be disposed of other than by sale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. No definition available.
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. No definition available.
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