Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
OTHER PHYSICAL PROPERTY:
Other physical property, accumulated depreciation	$ 251	$ 240
CURRENT ASSETS:
Receivables, reserves	$ 341	$ 320
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)	12,827,367	12,979,281
Common stock, outstanding (in shares)	12,827,367	12,979,281
Preferred stock, authorized (in shares)	500,000	500,000
Preferred stock, issued (in shares)	0	0