Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 08, 2021	Jun. 30, 2020
Cover [Abstract]
Entity Registrant Name	INSIGNIA SYSTEMS INC/MN
Entity Central Index Key	0000875355
Document Type	10-K/A
Document Period End Date	Dec. 31, 2020
Amendment Flag	true
Amendment Description	Insignia Systems, Inc. (“we”, “us”, “our” and the “Company”) is filing this Amendment No. 1 on Form 10-K/A (the “Amendment”) to amend its Annual Report on Form 10-K for the fiscal year ended December 31, 2020, originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 11, 2021 (the “Original Report”). In filing this amendment, the Company is restating its previously issued audited financial statements for the years ended December 31, 2020 and 2019 to account for misstatements related to sales taxes. Those previously issued financial statements should no longer be relied upon. Except as described below, all other information in, and the exhibits to, the Original Report remain unchanged. Accordingly, this Amendment should be read in conjunction with the Original Report and with our filings with the SEC made after the Original Report. This Amendment speaks as of the date of the Original Report and the Company has not updated the Original Report to reflect events occurring subsequent to the date of the Original Report.
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	MN
Entity File Number	1-13471
Entity Public Float			$ 3,965,000
Entity Common Stock, Shares Outstanding		1,754,030
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY