Document and Entity Information (USD $)	3 Months Ended
	Mar. 31, 2013	May 15, 2013	Jun. 29, 2012
Document and Entity Information:
Entity Registrant Name	Brenham Oil & Gas Corp.
Document Type	10-Q
Document Period End Date	Mar. 31, 2013
Amendment Flag	false
Entity Central Index Key	0001501720
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		117,079,937
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Entity Public Float			$ 618,821