Document And Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2021	Nov. 29, 2021	Mar. 31, 2021
Document Information [Line Items]
Entity Central Index Key	0001508348
Entity Registrant Name	Americann, Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	000-54231
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-4336843
Entity Address, Address Line One	1555 Blake Street, Unit 502
Entity Address, City or Town	Denver
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80202
City Area Code	303
Local Phone Number	862-9000
Title of 12(g) Security	Common Stock, ($0.001 Par Value)
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 15,489,000
Entity Common Stock, Shares Outstanding		24,196,310