Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Allowance for uncollectible accounts	$ 225	$ 235
Capitalization:
Common stock, par value	$ 0.521	$ 0.521
Common stock, shares authorized	36,000,000	36,000,000
Common stock, shares issued	18,592,827	18,551,540
Common stock, shares outstanding	18,592,827	18,551,540