Note 11 - Lease (Details Textual)	9 Months Ended
Sep. 30, 2017 USD ($)
Operating Leases, Monthly Rent Payment	$ 3,205

The amount of monthly rent payment pursuant to the operating leases agreement.

No definition available.

Name:	cenb_OperatingLeasesMonthlyRentPayment
Namespace Prefix:	cenb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration