Note 1 - Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2021
Notes to Financial Statements
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]	NOTE 1 – BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The accompanying unaudited interim condensed consolidated financial statements and related notes have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information, and with the rules and regulations of the United States Securities and Exchange Commission (the “SEC”) set forth in Article 8 of Regulation S- X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The unaudited interim financial statements furnished reflect all adjustments (consisting of normal recurring accruals) which are, in the opinion of management, necessary to a fair statement of the results for the interim periods presented. Unaudited interim results are not necessarily indicative of the results for the full fiscal year. These financial statements should be read in conjunction with the condensed consolidated financial statements of the Company for the year ended December 31, 2020 and notes thereto. There have been no material changes in the Company's significant accounting policies as compared to the significant accounting policies described in the Company's annual report on Form 10 -K for the year ended December 31, 2020. Loss per Share Net loss per common share is computed pursuant to ASC 260 - 10 - 45. Basic loss per share is computed based on the weighted average number of common shares outstanding during the period. Diluted net loss per share is calculated by dividing net loss by the diluted weighted average common shares outstanding, which includes the effect of potentially dilutive securities. During periods when there is a net loss, all potentially dilutive shares are anti-dilutive and are excluded from the calculation of net loss per share. Diluted earnings per share is similarly computed except that the denominator includes the effect, using the treasury stock method, of unvested restricted stock and convertible notes, if including such potential shares of common stock is dilutive. For the three -months ended March 31, 2021 and 2020, the common stock equivalents of the convertible note agreements were not included in diluted earnings per share computations because their effect was antidilutive. Recent Developments In April of 2021, the Company's common stock began to be quoted on the OTC Link alternative trading system (operated by OTC Markets Group Inc.) under the trading symbol “CENBF” on the OTC Pink tier. There is no assurance that an active trading market for our shares will develop or will be sustained if developed. Recently Adopted Accounting Pronouncements No pronouncements were adopted by the Company during the three -month period ended March 31, 2021. Recent Accounting Pronouncements Not Yet Adopted In August 2020, the Financial Accounting Standards Board (“FASB”) issued an accounting pronouncement (ASU 2020 - 06 ) related to the measurement and disclosure requirements for convertible instruments and contracts in an entity's own equity. The pronouncement simplifies and adds disclosure requirements for the accounting and measurement of convertible instruments and the settlement assessment for contracts in an entity's own equity. As a smaller reporting company, as defined by the SEC, this pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2023. The Company is currently evaluating the impact of this ASU on the consolidated financial statements.

NOTE

–

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

The accompanying unaudited interim condensed consolidated financial statements and related notes have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information, and with the rules and regulations of the United States Securities and Exchange Commission (the “SEC”) set forth in Article

of Regulation S-

Accordingly, they do

not

include all of the information and footnotes required by U.S. GAAP for complete financial statements. The unaudited interim financial statements furnished reflect all adjustments (consisting of normal recurring accruals) which are, in the opinion of management, necessary to a fair statement of the results for the interim periods presented. Unaudited interim results are

not

necessarily indicative of the results for the full fiscal year. These financial statements should be read in conjunction with the condensed consolidated financial statements of the Company for the year ended

December 31, 2020

and notes thereto.

There have been

material changes in the Company's significant accounting policies as compared to the significant accounting policies described in the Company's annual report on Form

-K for the year ended

December 31, 2020.

Loss per Share

Net loss per common share is computed pursuant to ASC

260

45.

Basic loss per share is computed based on the weighted average number of common shares outstanding during the period. Diluted net loss per share is calculated by dividing net loss by the diluted weighted average common shares outstanding, which includes the effect of potentially dilutive securities. During periods when there is a net loss, all potentially dilutive shares are anti-dilutive and are excluded from the calculation of net loss per share. Diluted earnings per share is similarly computed except that the denominator includes the effect, using the treasury stock method, of unvested restricted stock and convertible notes, if including such potential shares of common stock is dilutive. For the

three

-months ended

March 31, 2021

and

2020,

the common stock equivalents of the convertible note agreements were

not

included in diluted earnings per share computations because their effect was antidilutive.

Recent Developments

April

2021,

the Company's common stock began to be quoted on the OTC Link alternative trading system (operated by OTC Markets Group Inc.) under the trading symbol “CENBF” on the OTC Pink tier. There is

assurance that an active trading market for our shares will develop or will be sustained if developed.

Recently Adopted Accounting Pronouncements

pronouncements were adopted by the Company during the

three

-month period ended

March 31, 2021.

Recent Accounting Pronouncements

Not

Yet Adopted

August 2020,

the Financial Accounting Standards Board (“FASB”) issued an accounting pronouncement (ASU

2020

) related to the measurement and disclosure requirements for convertible instruments and contracts in an entity's own equity. The pronouncement simplifies and adds disclosure requirements for the accounting and measurement of convertible instruments and the settlement assessment for contracts in an entity's own equity. As a smaller reporting company, as defined by the SEC, this pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after

December 15, 2023.

The Company is currently evaluating the impact of this ASU on the consolidated financial statements.