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Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
OPERATING REVENUE $ 50,139 $ 51,149
Production Costs:    
Purchased water 10,119 13,577
Power 885 865
Groundwater extraction charges 4,590 2,946
Other production costs 2,713 2,756
Total production costs 18,307 20,144
Administrative and general 11,494 10,548
Maintenance 3,200 2,989
Property taxes and other non-income taxes 2,549 2,435
Depreciation and amortization 8,816 8,308
Total operating expense 44,366 44,424
OPERATING INCOME 5,773 6,725
OTHER (EXPENSE) INCOME:    
Interest on long-term debt (4,645) (4,680)
Mortgage and other interest expense (377) (395)
Gain on sale of real estate investment 1,063 0
Dividend income 62 60
Other, net 371 198
Income before income taxes 2,247 1,908
Provision for income taxes 930 799
NET INCOME 1,317 1,109
Other comprehensive income (loss), net 354 (11)
COMPREHENSIVE INCOME $ 1,671 $ 1,098
EARNINGS PER SHARE    
Basic $ 0.07 $ 0.06
Diluted $ 0.07 $ 0.06
DIVIDENDS PER SHARE $ 0.18 $ 0.18
WEIGHTED AVERAGE SHARES OUTSTANDING    
Basic 18,689,367 18,611,752
Diluted 18,888,909 18,821,087