Statement of Stockholders' Equity (Parentheticals) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended
Jul. 31, 2013	Jun. 30, 2013	May 31, 2013	Apr. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Stockholders Equity [Abstract]
Dividends Declared Per Common Share	$ 0.135	$ 0.135	$ 0.135	$ 0.135	$ 0.135	$ 0.405	$ 0	$ 0.540	$ 0

Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration