Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 15, 2020
Document And Entity Information
Entity Registrant Name	SPINDLETOP OIL & GAS CO
Entity Central Index Key	0000867038
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity's Reporting Status Current?	Yes
Is Entity a Shell Company?	false
Entity Interactive Data Current	Yes
Is Entity Emerging Growth Company?	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Common Stock, Shares Outstanding		6,809,602
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2020