Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Shareholders' Equity
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	14,359,460	14,217,303
Common stock, shares outstanding (in shares)	14,359,460	14,217,303