Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (Parentheticals) (Preferred Stock [Member])	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Preferred Stock [Member]
Preferred stock dividends	5.00%	5.00%

The percentage rate used to calculate dividend payments on preferred stock.

No definition available.

Name:	us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration