Unaudited Condensed Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current Assets:
Allowance for doubtful accounts	$ 433	$ 434
Stockholders' Equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued and outstanding	64,266,489	64,015,789
Preferred Stock [Member]
Stockholders' Equity:
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred Stock Series A Junior Participating [Member]
Stockholders' Equity:
Preferred stock, shares authorized	75,000	75,000