Note 20 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	14 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Feb. 28, 2018
Payment for Blockchain Technology Based Applications Development Costs		$ 1,200	$ 3,730
Contract to Develop Blockchain Technology Based Applications [Member]
Application Development Contracts, Contract Amount				$ 4,940	$ 4,500

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