Note 19 - Restricted Net Assets (Details Textual) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries	$ 8,100	$ 7,800
Withholding Tax Rate Pursuant To EIT Law	10.00%
Preferential Withholding Tax Rate	5.00%
Statutory Accounting Practices, Retained Earnings Not Available for Dividends	$ 2,607	2,607
PRC Subsidiary And VIE's [Member]
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries	14,800	17,600
Statutory Accounting Practices, Retained Earnings Not Available for Dividends	$ 2,600	$ 2,500
WFOE [Member]
Minimum Percentage Of Annual After-tax Profit For General Reserve	10.00%
Minimum Required Reserve As Percent Of Registered Capital	50.00%
Domestic Enterprise [Member]
Minimum Percentage Of Annual After-tax Profit For General Reserve	10.00%
Minimum Required Reserve As Percent Of Registered Capital	50.00%

Minimum percentage of annual after-tax profit required to be appropriated as general reserve.

No definition available.

Name:	cnet_MinimumPercentageOfAnnualAftertaxProfitForGeneralReserve
Namespace Prefix:	cnet_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum aggregate compulsory appropriation of general reserve, measured by percentage of registered capital.

+ References

No definition available.

+ Details

Name:	cnet_MinimumrequiredReserveAsPercentOfRegisteredCapital
Namespace Prefix:	cnet_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Preferential withholding tax rate in PRC.

+ References

No definition available.

+ Details

Name:	cnet_PreferentialWithholdingTaxRate
Namespace Prefix:	cnet_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Withholding tax rate pursuant to PRC Enterprise Income Tax law.

+ References

No definition available.

+ Details

Name:	cnet_WithholdingtaxRatePursuantToEitLaw
Namespace Prefix:	cnet_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e)(3)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of retained earnings as of the balance sheet date that cannot be distributed to stockholders pursuant to statutory rules and regulations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

+ Details

Name:	us-gaap_StatutoryAccountingPracticesRetainedEarningsNotAvailableForDividends
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=cnet_PRCSubsidiaryAndVIEsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=cnet_WFOEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=cnet_DomesticEnterpriseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: