CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 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)	18,874,256	18,844,817
Common share Outstanding (in shares)	18,874,256	18,844,817