Note 8 - Long-term Investments - Movement in Other Ownership Interest Investments (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 USD ($)
Investments, balance	$ 918		$ 1,340
Cash investment returned during the year	(437)		(459)
Impairment on the investments	(437)		(46)
Exchange translation adjustment	(44)		83
Investments, balance			918
ChinaNet Chuang Tou [Member]
Investments, balance	918		1,297
Cash investment returned during the year	(437)	¥ (3,000)	(459)
Impairment on the investments	(437)
Exchange translation adjustment	(44)		80
Investments, balance			918
Guohua Shiji [Member]
Investments, balance			27
Cash investment returned during the year
Impairment on the investments			(29)
Exchange translation adjustment			2
Investments, balance
Beijing Saturday [Member]
Investments, balance			16
Cash investment returned during the year
Impairment on the investments			(17)
Exchange translation adjustment			1
Investments, balance

Represents the amount of exchange translation adjustment during the period related to investment in equity security without readily determinable fair value.

No definition available.

+ Details

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Namespace Prefix:	cnet_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the amount of cash returned related to investments.

+ References

No definition available.

+ Details

Name:	cnet_InvestmentsCashReturned
Namespace Prefix:	cnet_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This item represents a decline in value that has been recognized against an investment categorized as other ownership interest impairment.

+ References

No definition available.

+ Details

Name:	cnet_OtherOwnershipInterestsImpairment
Namespace Prefix:	cnet_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) and 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 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

+ Details

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Period Type:	instant

- Details

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- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cnet_GuohuaShijiMember
Namespace Prefix:
Data Type:	na
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Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cnet_BeijingSaturdayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: