Consolidated Condensed Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Statement of Financial Position [Abstract]
Allowance for doubtful accounts and discounts	$ 1,842	$ 1,792
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	15,000,000	15,000,000
Common stock, issued shares	4,607,902	4,607,902
Shares of common stock in treasury	1,160,760	1,166,545