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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2024
Aug. 07, 2024
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2024  
Document Transition Report false  
Entity Registrant Name CLEARSIGN TECHNOLOGIES CORPORATION  
Securities Act File Number 001-35521  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 26-2056298  
Entity Address, Address Line One 8023 E. 63rd Place, Suite 101  
Entity Address, City or Town Tulsa  
Entity Address, State or Province OK  
Entity Address, Postal Zip Code 74133  
City Area Code 918  
Local Phone Number 236-6461  
Title of 12(b) Security Common Stock  
Trading Symbol CLIR  
Security Exchange Name NASDAQ  
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  
Entity Common Stock, Shares Outstanding   50,205,657
Entity Central Index Key 0001434524  
Document Fiscal Year Focus 2024  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Amendment Flag false