Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2018	Dec. 21, 2018	Mar. 31, 2018
Document and Entity Information
Entity Registrant Name	Timberline Resources Corp
Document Type	10-K
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Entity Central Index Key	0001288750
Current Fiscal Year End Date	--09-30
Entity Common Stock, Shares Outstanding		61,027,819
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Public Float			$ 6,124,729
Entity Incorporation, State Country Name	Delaware
Trading Symbol	tlrs