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Note 5 - Prepayments and Deposit to Suppliers - Prepayments and Deposit to Suppliers (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Prepayment and deposit to suppliers, net | $ 2,049 | $ 2,154
Deposits to TV Ad and Internet Ad Resources Providers [Member] |  |
Prepayment and deposit to suppliers, net | 656 | 963
Prepayment to TV Ad and Internet Ad Resources Providers [Member] |  |
Prepayment and deposit to suppliers, net | 1,081 | 727
Other Deposits and Prepayments [Member] |  |
Prepayment and deposit to suppliers, net | $ 312 | $ 464

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- Definition Carrying amount as of the balance sheet date of capitalized payments for supplies which will be consumed in operations within one year or the normal operating cycle, if longer, and deposits to suppliers to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, which will be either consumed in operations or refunded within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | cnet_PrepaymentAndDepositToSuppliers
Namespace Prefix: | cnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=cnet_DepositsToTVAdAndInternetAdResourcesProvidersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=cnet_PrepaymentToTVAdAndInternetAdResourcesProvidersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=cnet_OtherDepositsAndPrepaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |