Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2016
Feb. 23, 2017
Jun. 30, 2016
Document And Entity Information      
Entity Registrant Name MECHANICAL TECHNOLOGY INC    
Entity Central Index Key 0000064463    
Current Fiscal Year End Date --12-31    
Amendment Flag false    
Document Type 10-K    
Document Period End Date Dec. 31, 2016    
Entity a Well-known Seasoned Issuer No    
Entity a Voluntary Filer No    
Entity's Reporting Status Current Yes    
Entity Filer Category Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   9,020,393  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2016    
Entity Public Float     $ 3,702,364