CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Common Stock, No Par Value; Shares Authorized- 40,000; Shares Outstanding- 2012 - 15,703, 2011 - 15,682	$ 142,592	$ 141,432
Retained Earnings	35,168	35,549
TOTAL COMMON EQUITY	177,760	176,981
TOTAL PREFERRED STOCK	3,353	3,353
Long-term Debt:
8.05%, Amortizing Secured Note, due December 20, 2021	2,245	2,319
6.25%, Amortizing Secured Note, due May 19, 2028	6,685	6,895
6.44%, Amortizing Secured Note, due August 25, 2030	5,087	5,227
6.46%, Amortizing Secured Note, due September 19, 2031	5,367	5,507
4.22%, State Revolving Trust Note, due December 31, 2022	527	546
3.30% to 3.60%, State Revolving Trust Note, due May 1, 2025	3,519	3,623
3.49%, State Revolving Trust Note, due January 25, 2027	618	633
4.03%, State Revolving Trust Note, due December 1, 2026	805	825
4.00% to 5.00%, State Revolving Trust Bond, due August 1, 2021	434	434
0.00%, State Revolving Fund Bond, due August 1, 2021	352	359
3.64%, State Revolving Trust Note, due July 1, 2028	356	364
3.64%, State Revolving Trust Note, due January 1, 2028	119	122
3.45%, State Revolving Trust Note, due August 1, 2031	392	39
6.59%, Amortizing Secured Note, due April 20, 2029	5,871	6,046
7.05%, Amortizing Secured Note, due January 20, 2030	4,396	4,521
5.69%, Amortizing Secured Note, due January 20, 2030	9,017	9,273
3.75%, State Revolving Trust Note, due July 1, 2031	2,664	2,021
3.75%, State Revolving Trust Note, due November 30, 2030	1,415	1,404
First Mortgage Bonds:
5.20%, Series S, due October 1, 2022	12,000	12,000
5.25%, Series T, due October 1, 2023	6,500	6,500
5.25%, Series V, due February 1, 2029	10,000	10,000
5.35%, Series W, due February 1, 2038	23,000	23,000
0.00%, Series X, due September 1, 2018	368	375
4.25% to 4.63%, Series Y, due September 1, 2018	410	410
0.00%, Series Z, due September 1, 2019	876	894
5.25% to 5.75%, Series AA, due September 1, 2019	1,080	1,080
0.00%, Series BB, due September 1, 2021	1,183	1,206
4.00% to 5.00%, Series CC, due September 1, 2021	1,400	1,400
5.10%, Series DD, due January 1, 2032	6,000	6,000
0.00%, Series EE, due August 1, 2023	4,709	4,804
3.00% to 5.50%, Series FF, due August 1, 2024	6,160	6,160
0.00%, Series GG, due August 1, 2026	1,330	1,352
4.00% to 5.00%, Series HH, due August 1, 2026	1,640	1,640
0.00%, Series II, due August 1, 2024	1,127	1,150
3.40% to 5.00%, Series JJ, due August 1, 2027	1,560	1,560
0.00%, Series KK, due August 1, 2028	1,500	1,526
5.00% to 5.50%, Series LL, due August 1, 2028	1,635	1,635
0.00%, Series MM, due August 1, 2030	1,868	1,901
3.00% to 4.375%, Series NN, due August 1, 2030	1,985	1,985
0.00%, Series OO, due August 1, 2031	2,960
2.00% to 5.00%, Series PP, due August 1, 2031	915
SUBTOTAL LONG-TERM DEBT	140,075	136,736
Less: Current Portion of Long-term Debt	(4,996)	(4,569)
TOTAL LONG-TERM DEBT	135,079	132,167
Cumulative Preferred Stock
TOTAL PREFERRED STOCK
Convertible Preferred Stock $7.00 Series
TOTAL PREFERRED STOCK	1,457	1,457
Convertible Preferred Stock $8.00 Series
TOTAL PREFERRED STOCK	816	816
Nonredeemable Preferred Stock $7.00 Series
TOTAL PREFERRED STOCK	80	80
Nonredeemable Preferred Stock $4.75 Series
TOTAL PREFERRED STOCK	$ 1,000	$ 1,000