Note 4 - Intangible Assets (Details Textual) - USD ($)				1 Months Ended	7 Months Ended	12 Months Ended
Note 4 - Intangible Assets (Details Textual) - USD ($)	Oct. 07, 2021	Apr. 03, 2019	Sep. 12, 2016	Mar. 31, 2018	Sep. 30, 2018	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021	Jul. 09, 2021	Mar. 31, 2021
Stock Issued During Period, Value, Purchase of Assets				$ 5
Development of Acquired Technology, Annual Compensation for Specialist			$ 200,000
Noncash or Part Noncash Acquisition, Noncash Consideration, Liability Incurred		$ 4,380,000
Contingent Consideration Classified as Equity, Fair Value Disclosure							$ 1,380,000			$ 1,380,000
Impairment of Real Estate						$ 0	$ 0
Tesla Digital Transaction [Member]
Stock Issued During Period, Value, Purchase of Assets	$ 2,042,500
Stock Issued During Period, Shares, Purchase of Assets (in shares)	5,000,000
Stock Issued During Period, Purchase of Assets, Expense	$ 1,634,000
Asset Acquisition, Liabilities Assumed	302,186
Gain (Loss) on Settlement of Lighting Patent Purchase, Including Shares Issued	$ (1,331,814)
Tesla Digital [Member]
Stock Issued During Period, Shares, Purchase of Assets (in shares)					1,000,000
Patented Technology [Member]
Stock Issued During Period, Value, Purchase of Assets			5,000,000
Noncash or Part Noncash Acquisition, Noncash Consideration, Carrying Value of Properties to be Transferred			2,161,467
Noncash or Part Noncash Acquisition, Noncash Consideration, Original Cost of Property Transferred			$ 202,666
Lighting Patent [Member]
Finite-Lived Intangible Asset, Expected Amortization, Year One						424,812
Finite-Lived Intangible Asset, Expected Amortization, Year Eleven								$ 283,215
Finite-Lived Intangible Asset, Expected Amortization, Year Four						424,812
Finite-Lived Intangible Asset, Expected Amortization, Year Five						424,812
Finite-Lived Intangible Asset, Expected Amortization, Year Seven						424,812
Finite-Lived Intangible Asset, Expected Amortization, Year Two						424,812
Finite-Lived Intangible Asset, Expected Amortization, Year Three						424,812
Finite-Lived Intangible Asset, Expected Amortization, Year Six						424,812
Finite-Lived Intangible Asset, Expected Amortization, Year Eight						424,812
Finite-Lived Intangible Asset, Expected Amortization, Year Nine						424,812
Finite-Lived Intangible Asset, Expected Amortization, Year Ten						$ 424,812
Customers Relationships and Trade Names [Member]
Finite-Lived Intangible Asset, Expected Amortization, Year One									$ 29,300
Finite-Lived Intangible Asset, Expected Amortization, Year Four									25,400
Finite-Lived Intangible Asset, Expected Amortization, Year Five									21,400
Finite-Lived Intangible Asset, Expected Amortization, Year Seven									32,100
Finite-Lived Intangible Asset, Expected Amortization, Year Two									29,300
Finite-Lived Intangible Asset, Expected Amortization, Year Three									29,300
Finite-Lived Intangible Asset, Expected Amortization, Year Six									21,400
Finite-Lived Intangible Asset, Expected Amortization, Year Eight									$ 32,100

CEN BIOTECH INC 10-Q