CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Current Assets
Accounts receivable, allowances	$ 464,000	$ 423,000
Shareholders' Equity
Voting Preferred Stock No Par Value	$ 0	$ 0
Voting Preferred Stock Shares Authorized In Shares	1,000,000	1,000,000
Nonvoting Preferred Stock No Par Value	$ 0	$ 0
Nonvoting Preferred Stock Shares Authorized In Shares	1,000,000	1,000,000
Common Stock, no par value (in dollars per share)	$ 0	$ 0
Common Stock, shares authorized (in shares)	50,000,000	50,000,000
Common Stock, shares issued (in shares)	8,908,928	8,908,607
Treasury Stock, shares (in shares)	2,694,729	2,694,729