Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
OTHER PHYSICAL PROPERTY:
Other physical property, accumulated depreciation	$ 202	$ 190
CURRENT ASSETS:
Receivables, reserves	$ 362	$ 245
COMMON STOCKHOLDERS' EQUITY:
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	46,500,000	46,500,000
Common stock, issued (in shares)	12,767,783	12,692,054
Common stock, outstanding (in shares)	12,767,783	12,692,054
Preferred stock, authorized (in shares)	500,000	500,000
Preferred stock, issued (in shares)	0	0