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Cover - shares
 6 Months Ended
Jun. 30, 2021
Aug. 19, 2021
Cover [Abstract]    
Entity Registrant Name INSIGNIA SYSTEMS INC/MN  
Entity Central Index Key 0000875355  
Document Type 10-Q  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Document Period End Date Jun. 30, 2021  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2021  
Entity Common Stock Shares Outstanding   1,765,319
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Entity File Number 1-13471  
Entity Incorporation State Country Code MN  
Entity Tax Identification Number 41-1656308  
Entity Address Address Line 1 7308 Aspen Lane N  
Entity Address Address Line 2 Suite 153  
Entity Address City Or Town Minneapolis  
Entity Address State Or Province MN  
Entity Address Postal Zip Code 55428  
City Area Code 763  
Local Phone Number 392-6200  
Security 12b Title Common Stock, $0.01 par value  
Trading Symbol ISIG  
Security Exchange Name NASDAQ