Each share of preferred stock is entitled to a certain amount of votes.

No definition available.

Name:	cenb_PreferredStockVotingRightsPerEachShare
Namespace Prefix:	cenb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Per share amount paid for stock repurchased.

+ References

No definition available.

+ Details

Name:	cenb_StockRepurchasedPricePerShare
Namespace Prefix:	cenb_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

+ Details

Name:	us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Face amount per share of no-par value common stock.

+ References

+ Details

Name:	us-gaap_CommonStockNoParValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

+ Details

Name:	us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=cenb_JamesRobinsonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 14 - Shareholders' Deficit / Stock Activity (Details Textual)	Nov. 27, 2018 $ / shares shares	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 $ / shares
Common Stock, No Par Value (in dollars per share) \| $ / shares		$ 0	$ 0
Preferred Stock [Member] \| James Robinson [Member]
Stock Repurchased and Retired During Period, Shares (in shares) \| shares	714
Stock Repurchased, Price Per Share (in dollars per share) \| $ / shares	$ 0.07
Preferred Stock, Voting Rights Per Each Share	500
Convertible Debt [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares) \| shares		5,268,749