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v3.25.2

Related parties (Details) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Total due from related parties | $ 3,805 |
Total due from related parties | 1,830 | $ 8,251
Dream Legal Group, Inc. [Member] |  |
Total due from related parties | $ 3,805 | $ 8,251

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- References No definition available. + Details
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Namespace Prefix: | class_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | class_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=class_DreamLegalGroupIncMember
Namespace Prefix: |
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Balance Type: |
Period Type: |