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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Common Stock, No Par Value $ 151,337 $ 150,763
Retained Earnings 57,459 55,931
TOTAL COMMON EQUITY 208,796 206,694
TOTAL PREFERRED STOCK 2,436 2,436
SUBTOTAL LONG-TERM DEBT 138,766 140,279
Add: Premium on Issuance of Long-term Debt 1,654 1,707
Less: Unamortized Debt Expense (3,284) (3,339)
Less: Current Portion of Long-term Debt (5,691) (5,739)
TOTAL LONG-TERM DEBT 131,445 132,908
Convertible Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 1,007 1,007
Convertible Preferred Stock $8.00 Series [Member]    
TOTAL PREFERRED STOCK 349 349
Nonredeemable Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 80 80
Nonredeemable Preferred Stock $4.75 Series [Member]    
TOTAL PREFERRED STOCK 1,000 1,000
Amortizing Secured Note, due December 20, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 1,578 1,629
Amortizing Secured Note, due May 19, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 5,110 5,215
Amortizing Secured Note, due August 25, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 4,037 4,107
Amortizing Secured Note, due September 19, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 4,317 4,387
State Revolving Trust Note, due December 31, 2022 [Member]    
SUBTOTAL LONG-TERM DEBT 376 376
State Revolving Trust Note, due May 1, 2025 [Member]    
SUBTOTAL LONG-TERM DEBT 2,267 2,267
State Revolving Trust Note, due March 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 450 469
State Revolving Trust Note, due January 25, 2027 [Member]    
SUBTOTAL LONG-TERM DEBT 483 501
State Revolving Trust Note, due December 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 651 651
State Revolving Trust Bond 4.00% to 5.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 247 254
State Revolving Trust Bond 0.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 198 203
State Revolving Trust Note, due July 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 294 294
State Revolving Trust Note, due January 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 97 97
State Revolving Trust Note, due August 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 1,040 1,066
Amortizing Secured Note, due April 20, 2029 [Member]    
SUBTOTAL LONG-TERM DEBT 4,563 4,651
Amortizing Secured Note 7.05%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 3,458 3,521
Amortizing Secured Note 5.69%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 7,094 7,222
Amortizing Secured Note, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 14,597 14,707
State Revolving Trust Note, due July 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 2,303 2,303
State Revolving Trust Note, due November 30, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 1,216 1,216
First Mortgage Bonds - Series X [Member]    
SUBTOTAL LONG-TERM DEBT 158 162
First Mortgage Bonds - Series Y [Member]    
SUBTOTAL LONG-TERM DEBT 179 185
First Mortgage Bonds - Series Z [Member]    
SUBTOTAL LONG-TERM DEBT 438 446
First Mortgage Bonds - Series AA [Member]    
SUBTOTAL LONG-TERM DEBT 565 565
First Mortgage Bonds - Series BB [Member]    
SUBTOTAL LONG-TERM DEBT 708 723
First Mortgage Bonds - Series CC [Member]    
SUBTOTAL LONG-TERM DEBT 875 895
First Mortgage Bonds - Series EE [Member]    
SUBTOTAL LONG-TERM DEBT 3,055 3,132
First Mortgage Bonds - Series FF [Member]    
SUBTOTAL LONG-TERM DEBT 3,690 3,690
First Mortgage Bonds - Series GG [Member]    
SUBTOTAL LONG-TERM DEBT 976 993
First Mortgage Bonds - Series HH [Member]    
SUBTOTAL LONG-TERM DEBT 1,020 1,300
First Mortgage Bonds - Series II [Member]    
SUBTOTAL LONG-TERM DEBT 771 789
First Mortgage Bonds - Series JJ [Member]    
SUBTOTAL LONG-TERM DEBT 904 1,010
First Mortgage Bonds - Series KK [Member]    
SUBTOTAL LONG-TERM DEBT 1,146 1,167
First Mortgage Bonds - Series LL [Member]    
SUBTOTAL LONG-TERM DEBT 1,365 1,365
First Mortgage Bonds - Series MM [Member]    
SUBTOTAL LONG-TERM DEBT 1,404 1,437
First Mortgage Bonds - Series NN [Member]    
SUBTOTAL LONG-TERM DEBT 1,675 1,675
First Mortgage Bonds - Series OO [Member]    
SUBTOTAL LONG-TERM DEBT 2,358 2,408
First Mortgage Bonds - Series PP [Member]    
SUBTOTAL LONG-TERM DEBT 815 815
First Mortgage Bonds - Series QQ [Member]    
SUBTOTAL LONG-TERM DEBT 9,915 9,915
First Mortgage Bonds - Series RR [Member]    
SUBTOTAL LONG-TERM DEBT 22,500 22,500
First Mortgage Bonds - Series SS [Member]    
SUBTOTAL LONG-TERM DEBT 23,000 23,000
First Mortgage Bonds - Series TT [Member]    
SUBTOTAL LONG-TERM DEBT 2,509 2,559
First Mortgage Bonds - Series UU [Member]    
SUBTOTAL LONG-TERM DEBT 935 935
First Mortgage Bonds - Series VV [Member]    
SUBTOTAL LONG-TERM DEBT 2,529 2,577
First Mortgage Bonds - Series WW [Member]    
SUBTOTAL LONG-TERM DEBT $ 900 $ 900