Condensed Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Receivables:
Allowance for trade receivable	$ 55	$ 55
Allowance for notes receivable	$ 60	$ 60
Shareholders' Equity:
Percentage of noncumulative preferred stock	10.00%	10.00%
Preferred stock, par value	$ 50	$ 50
Preferred stock, shares authorized	640	640
Preferred stock, shares issued	640	640
Preferred stock, shares outstanding	640	640
Common stock, par value	$ 0.50	$ 0.50
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	4,830,503	4,822,650
Common stock, shares outstanding	4,830,503	4,822,650