Note 3 - Notes Receivable - Schedule of Notes Receivables (Details) (Parentheticals) - USD ($)	3 Months Ended	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019	Aug. 15, 2018
Notes and other receivables, allowance		$ 1,761,675
BASK [Member]
Interest rate	18.00%	18.00%	18.00%
Periodic payment	$ 4,422	$ 4,422
Wellness Group Pharms LLC [Member]
Secured note	$ 673,294	$ 673,294
Interest rate	18.00%	18.00%
Accrued consulting fees	$ 206,675	$ 206,675
Construction advances	332,357	332,357
Accrued interest	549,349	549,349
Notes and other receivables, allowance	$ 0	$ 1,761,675

The construction advance payment received from the counterparty.

No definition available.

Name:	acan_ConstructionAdvancePaymentReceived
Namespace Prefix:	acan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The monthly fee charged to counterparty by the company.

+ References

No definition available.

+ Details

Name:	acan_ConsultingServicesRevenueMonthly
Namespace Prefix:	acan_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The interest rate charged on financing to counterparty under agreement.

+ References

No definition available.

+ Details

Name:	acan_NoteReceivableInterestRate
Namespace Prefix:	acan_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

No definition available.

+ Details

Name:	acan_NoteReceivablePeriodicPayment
Namespace Prefix:	acan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The receivable amount of advances made to counterparty as working capital.

+ References

No definition available.

+ Details

Name:	acan_WorkingCapitalAdvancesReceivable
Namespace Prefix:	acan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance for credit loss on financing receivable, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_AllowanceForNotesAndLoansReceivableNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of noncurrent interest earned but not received. Also called accrued interest or accrued interest receivable.

+ 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(17))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_InterestReceivableNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=acan_BASKMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=acan_WellnessGroupPharmsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: