Condensed Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Condensed Balance Sheets
Valuation allowances and reserves	$ 5,531	$ 7,798
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	1,000,000	1,000,000
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	43,000,000	43,000,000
Common stock, shares issued	6,429,095	6,429,095
Treasury stock, shares	814,479	800,350