Note 21 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2018
Payment for Blockchain Technology Based Applications Development Costs	$ 503	$ 160
Contract to Develop Blockchain Technology Based Applications [Member]
Application Development Contracts, Contract Amount	4,960		$ 4,500
Payment for Blockchain Technology Based Applications Development Costs	$ 4,410

The cash outflow associated with the development of blockchain technology based applications.

No definition available.

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