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Note Receivable from SPD Control Systems
 12 Months Ended
Dec. 31, 2012
Receivables [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

3) Note Receivable from SPD Control Systems

     On May 9, 2007, the Company began participating in the funding of the ongoing development of automotive controllers by SPD Control Systems Corp., a licensee of the Company (“SPD Control Systems”). This development work is to produce the electronic controllers to operate SPD-Smart automotive windows and glass roof systems for one or more of the top five automotive makers in the world. The Company’s funding of this project was reflected in the form of a senior secured convertible promissory note (the “Note”) of SPD Control Systems held by Research Frontiers’ wholly-owned subsidiary, SPD Enterprises Inc. (“SPD Enterprises”). The Note bore interest at 10% per annum, was secured by all of the assets (including intellectual property) of SPD Control Systems, and was convertible at the option of SPD Enterprises into common stock of SPD Control Systems at an initial conversion price of $0.50 per share. This conversion price was adjustable downward to result in the issuance to SPD Enterprises of additional shares of SPD Control Systems common stock under certain conditions. The Note provided funding of up to $150,000 by SPD Enterprises based upon the achievement of certain development milestones by SPD Control Systems. As part of a broader agreement between SPD Control Systems and the Company, effective May 9, 2010, the maturity date of this Note was extended to May 9, 2012 and the applicable conversion price for the Note was specified as $0.25 per share of SPD Control Systems stock through May 9, 2012 and $0.10 per share thereafter. On March 30, 2012 SPD Control Systems paid Research Frontiers $224,903 in full payment of the principal and accrued interest on the note.