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Note 8 - Long-term Investments - Summary of Long-term Investments (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 USD ($)
Balance | $ 2,280
Cash investments during the year | 0
Disposed during the year | 0
Balance | $ 2,216

X
- Definition The amount of equity securities without readily determinable fair value disposed of during the period. + References No definition available. + Details
Name: | cnet_EquitySecuritiesWithoutReadilyDeterminableFairValueAmountDisposedOf
Namespace Prefix: | cnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the increase in the amount of investment in equity security without readily determinable fair value attributable to cash investments during the period. + References No definition available. + Details
Name: | cnet_EquitySecuritiesWithoutReadilyDeterminableFairValueAmountIncreaseFromCashInvestments
Namespace Prefix: | cnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant