STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net Income (Loss)	$ 1,738	$ 2,348	$ 4,032	$ 4,694
Amount Included In Net Periodic Benefit Cost [Abstract]
Net actuarial loss	135	107	270	214
Prior service credit	(19)	(14)	(38)	(28)
Transition asset	15	15	30	30
Adjustment to post-retirement benefit plan	(1,034)	0	(1,034)	0
Income tax expense	360	(42)	308	(85)
Change in post-retirement benefit plan	(543)	66	(464)	131
Other comprehensive income (loss)	(543)	66	(464)	131
Comprehensive Income	$ 1,195	$ 2,414	$ 3,568	$ 4,825