Document And Entity Information	9 Months Ended
	Sep. 30, 2021 shares
Document Information [Line Items]
Entity Central Index Key	0000320340
Entity Registrant Name	INTELLIGENT SYSTEMS CORP
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	1-9330
Entity Incorporation, State or Country Code	GA
Entity Tax Identification Number	58-1964787
Entity Address, Address Line One	4355 Shackleford Road
Entity Address, City or Town	Norcross
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30093
City Area Code	770
Local Phone Number	381-2900
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
Title of 12(b) Security	Common Stock, $0.01 par value for the class
Trading Symbol	INS
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding	8,700,569