Stock Warrants	3 Months Ended
Mar. 31, 2015
Other Liabilities Disclosure [Abstract]
Stock Warrants	.

-- None. No documentation exists for this element. --

No definition available.

Name:	sfdl_StockWarrantsDisclosureTextBlock
Namespace Prefix:	sfdl_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration