DOCUMENT AND ENTITY INFORMATION (USD $)	12 Months Ended
	Dec. 31, 2011	Jun. 30, 2011	Apr. 16, 2012 Common Class A [Member]	Apr. 16, 2012 Common Class B [Member]
Entity Registrant Name	PRESIDENTIAL REALTY CORP/DE/
Entity Central Index Key	0000731245
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	pdnla
Entity Common Stock, Shares Outstanding			442,533	3,213,147
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2011
Entity Well-Known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$ 2,948,679