Note 3 - Notes and Other Receivables (Details Textual) - USD ($)		3 Months Ended
Jan. 18, 2018	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Credit Loss Expense (Reversal)		$ (1,761,675)
Demand for Arbitration against WGP [Member]
Litigation Settlement, Amount Awarded from Other Party	$ 1,045,000
Litigation Settlement, Amount Awarded Receivable from Other Party, Interest Rate	18.00%
Litigation Settlement Interest	$ (550,000)
Litigation Settlement, Amount Awarded from Other Party, Including Interest	$ 1,595,000

Amount awarded from other party, including accrued interest, in judgment or settlement of litigation.

No definition available.

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

- Definition

Interest rate directly attributable to an award in settlement of litigation.

+ References

No definition available.

+ Details

Name:	acan_LitigationSettlementAmountAwardedReceivableFromOtherPartyInterestRate
Namespace Prefix:	acan_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount awarded from other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Interest expense (income) directly attributable to an award in settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

Name:	us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_LitigationCaseAxis=acan_DemandForArbitrationAgainstWGPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: