Document and Entity Information - shares
3 Months Ended
Mar. 31, 2018
May 16, 2017
Document And Entity Information    
Entity Registrant Name POSITIVEID Corp  
Entity Central Index Key 0001347022  
Document Type 10-Q  
Document Period End Date Mar. 31, 2018  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   9,393,339
Trading Symbol PSID  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2018