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Note 21 - Agreements and Filings (Details Textual)	Jun. 30, 2020 shares
Common Stock, Shares Authorized for Resale, Shares (in shares)	6,851,843

X

- Definition

The number of shares authorized for resale.

+ References

No definition available.

+ Details

Name:	cenb_CommonStockSharesAuthorizedForResaleShares
Namespace Prefix:	cenb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration