CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Common Stock, No Par Value; Shares Authorized- 40,000; Shares Outstanding- 2013 - 15,844, 2012 - 15,795	$ 144,724	$ 143,572
Retained Earnings	39,685	38,060
TOTAL COMMON EQUITY	184,409	181,632
TOTAL PREFERRED STOCK	3,353	3,353
Long-term Debt:
8.05%, Amortizing Secured Note, due December 20, 2021	2,089	2,169
6.25%, Amortizing Secured Note, due May 19, 2028	6,265	6,475
6.44%, Amortizing Secured Note, due August 25, 2030	4,807	4,947
6.46%, Amortizing Secured Note, due September 19, 2031	5,087	5,227
4.22%, State Revolving Trust Note, due December 31, 2022	486	506
3.30% to 3.60%, State Revolving Trust Note, due May 1, 2025	3,305	3,413
3.49%, State Revolving Trust Note, due January 25, 2027	586	602
4.03%, State Revolving Trust Note, due December 1, 2026	763	784
4.00% to 5.00%, State Revolving Trust Note, due August 1, 2021	388	388
0.00%, State Revolving Fund Note, due August 1, 2021	313	320
3.64%, State Revolving Trust Note, due July 1, 2028	339	347
3.64%, State Revolving Trust Note, due January 1, 2028	113	116
3.45%, State Revolving Trust Note, due August 1, 2031	409	397
6.59%, Amortizing Secured Note, due April 20, 2029	5,523	5,697
7.05%, Amortizing Secured Note, due January 20, 2030	4,146	4,271
5.69%, Amortizing Secured Note, due January 20, 2030	8,504	8,761
3.75%, State Revolving Trust Note, due July 1, 2031	2,565	2,615
3.75%, State Revolving Trust Note, due November 30, 2030	1,361	1,388
First Mortgage Bonds:
0.00%, Series X, due September 1, 2018	316	322
4.25% to 4.63%, Series Y, due September 1, 2018	355	355
0.00%, Series Z, due September 1, 2019	766	782
5.25% to 5.75%, Series AA, due September 1, 2019	955	955
0.00%, Series BB, due September 1, 2021	1,064	1,085
4.00% to 5.00%, Series CC, due September 1, 2021	1,275	1,275
5.10%, Series DD, due January 1, 2032		6,000
0.00%, Series EE, due August 1, 2023	4,295	4,386
3.00% to 5.50%, Series FF, due August 1, 2024	5,755	5,755
0.00%, Series GG, due August 1, 2026	1,242	1,262
4.00% to 5.00%, Series HH, due August 1, 2026	1,560	1,560
0.00%, Series II, due August 1, 2024	1,038	1,060
3.40% to 5.00%, Series JJ, due August 1, 2027	1,235	1,235
0.00%, Series KK, due August 1, 2028	1,410	1,435
5.00% to 5.50%, Series LL, due August 1, 2028	1,570	1,570
0.00%, Series MM, due August 1, 2030	1,704	1,801
3.00% to 4.375%, Series NN, due August 1, 2030	1,910	1,910
0.00%, Series OO, due August 1, 2031	2,809	2,860
2.00% to 5.00%, Series PP, due August 1, 2031	915	915
5.00%, Series QQ, due October 1, 2023	9,915	9,915
3.80%, Series RR, due October 1, 2038	22,500	22,500
4.25%, Series SS, due October 1, 2047	23,000	23,000
0.00%, Series TT, due August 1, 2032	2,960
3.00% to 3.25%, Series UU, due August 1, 2032	1,015
SUBTOTAL LONG-TERM DEBT	136,613	140,361
Add: Premium on Long Term Debt	2,176	2,236
Less: Current Portion of Long-term Debt	(5,285)	(11,130)
TOTAL LONG-TERM DEBT	133,504	131,467
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