Note 14 - Governmental Assistance (Details Textual)	12 Months Ended
Dec. 31, 2021 USD ($)
Clear Com Media, Inc [Member]
Proceeds from Governmental Assistance	$ 171,078

Represents cash inflow from government assistance.

No definition available.

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