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Note 11 - Blockchain Software Application Platform Development Costs (Details Textual) $ in Thousands, ¥ in Millions | 6 Months Ended | 17 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 CNY (¥) | Feb. 28, 2018 USD ($)
Payment for Blockchain Technology Based Applications Development Costs |  | $ 3,752 | $ 3,720 |  |  |  |
Contract to Develop Blockchain Technology Based Applications [Member] |  |  |  |  |  |  |
Application Development Contracts, Contract Amount |  |  |  | $ 4,940 |  |  | $ 4,500
Contract to Develop Social Network Based Applications [Member] |  |  |  |  |  |  |
Application Development Contracts, Contract Amount |  |  |  |  | $ 440 | ¥ 3 |

X
- Definition Represents the amount of application development contract amount. + References No definition available. + Details
Name: | cnet_ApplicationDevelopmentContractsContractAmount
Namespace Prefix: | cnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow associated with the development of blockchain technology based applications. + References No definition available. + Details
Name: | cnet_PaymentForBlockchainTechnologyBasedApplicationsDevelopmentCosts
Namespace Prefix: | cnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=cnet_ContractToDevelopBlockchainTechnologyBasedApplicationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=cnet_ContractToDevelopSocialNetworkBasedApplicationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |