Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2019
May 01, 2019
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2019  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2019  
Entity Registrant Name COMMUNICATIONS SYSTEMS INC  
Entity Central Index Key 0000022701  
Current Fiscal Year End Date --12-31  
Trading Symbol JCS  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   9,316,576