Consolidated Statements of Stockholders' Equity (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Excess Tax Benefit	$ 27	$ 1,256	$ 643
Common Stock [Member]
Net Excess Tax Benefit	$ 27	$ 1,256	$ 643