Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information - shares
6 Months Ended
Jun. 30, 2022
Aug. 12, 2022
Document Information Line Items    
Entity Registrant Name cleantech Acquisition Corp.  
Trading Symbol CLAQ  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   6,095,789
Amendment Flag false  
Entity Central Index Key 0001849820  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Document Period End Date Jun. 30, 2022  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q2  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Shell Company true  
Entity Ex Transition Period false  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-40611  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 85-1699753  
Entity Address, Address Line One 207 West 25th Street  
Entity Address, Address Line Two 9th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10001  
City Area Code (212)  
Local Phone Number 494-9005  
Title of 12(b) Security Common Stock  
Security Exchange Name NASDAQ  
Entity Interactive Data Current Yes