CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Common shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	18,869,006	18,844,817
Common stock, outstanding (in shares)	18,869,006	18,844,817