XML 25 R1.htm IDEA: XBRL DOCUMENT v3.24.1
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Apr. 02, 2024
Jun. 30, 2023
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity Registrant Name CLEARSIGN TECHNOLOGIES CORPORATION    
Entity File Number 001-35521    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-2056298    
Entity Address, Address Line One 8023 East 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    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 40,360,983
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   39,039,273  
Entity Central Index Key 0001434524    
Document Fiscal Year Focus 2023    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name BPM CPA LLP    
Auditor Location Santa Monica, California    
Auditor Firm ID 207