Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 30, 2020	Jun. 30, 2019
Document And Entity Information
Entity Registrant Name	SPINDLETOP OIL & GAS CO
Entity Central Index Key	0000867038
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity a Well-known Seasoned Issuer?	No
Is Entity a Voluntary Filer?	No
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Business	false
Entity Interactive Data	Yes
Entity Public Float			$ 2,590,818
Entity Common Stock, Shares Outstanding		6,809,602
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019