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Loans receivable (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Oct. 31, 2022
Loans receivable [Abstract] |  |
Loan amount |  | $ 5,000,000
Interest rate percentage |  | 0.67%
Interest income | $ 167,500 |

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- References No definition available. + Details
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Namespace Prefix: | top_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of financing receivable balance that is past due. + References No definition available. + Details
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- Definition Amount of interest income earned from interest bearing assets classified as other. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of loan with variable or adjustable rate of interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 + Details
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