Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Shareholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	20,342,342	19,682,506
Capital in excess of par value, value of warrants issued	$ 0	$ 1,034
Capital in excess of par value, number of warrants issued	0	485,309