Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 15, 2021
Document Information [Line Items]
Entity Central Index Key	0001320760
Entity Registrant Name	TSS, Inc.
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2021
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-33627
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-2027651
Entity Address, Address Line One	110 E. Old Settlers Blvd
Entity Address, City or Town	Round Rock
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78664
City Area Code	512
Local Phone Number	310-1000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		18,596,793