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CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Common Stock, No Par Value $ 155,120 $ 153,045
Retained Earnings 74,055 65,392
TOTAL COMMON EQUITY 229,175 218,437
TOTAL PREFERRED STOCK 2,433 2,436
SUBTOTAL LONG-TERM DEBT 147,852 142,489
Add: Premium on Issuance of Long-term Debt 1,367 1,495
Less: Unamortized Debt Expense (3,309) (3,287)
Less: Current Portion of Long-term Debt (6,865) (6,159)
TOTAL LONG-TERM DEBT 139,045 134,538
Convertible Preferred Stock $7.00 Series    
SUBTOTAL LONG-TERM DEBT 1,005 1,007
Convertible Preferred Stock $8.00 Series [Member]    
SUBTOTAL LONG-TERM DEBT 349 349
Nonredeemable Preferred Stock $7.00 Series    
SUBTOTAL LONG-TERM DEBT 79 80
Nonredeemable Preferred Stock $4.75 Series [Member]    
SUBTOTAL LONG-TERM DEBT 1,000 1,000
Amortizing Secured Note, due December 20, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 1,180 1,415
Amortizing Secured Note, due May 19, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 4,375 4,795
Amortizing Secured Note, due August 25, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 3,547 3,827
Amortizing Secured Note, due September 19, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 3,827 4,107
State Revolving Trust Note, due December 31, 2022 [Member]    
SUBTOTAL LONG-TERM DEBT 279 329
State Revolving Trust Note, due May 1, 2025 [Member]    
SUBTOTAL LONG-TERM DEBT 1,851 2,062
State Revolving Trust Note, due March 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 392 431
State Revolving Trust Note2 [Member]    
SUBTOTAL LONG-TERM DEBT 427 465
State Revolving Trust Note, due December 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 553 603
State Revolving Trust Bond 4.00% to 5.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 162 213
State Revolving Trust Bond 0.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 128 166
State Revolving Trust Note, due July 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 256 276
State Revolving Trust Note, due January 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 84 91
State Revolving Trust Note, due August 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 962 1,015
Amortizing Secured Note, due April 20, 2029 [Member]    
SUBTOTAL LONG-TERM DEBT 3,953 4,302
Amortizing Secured Note 7.05%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 3,021 3,271
Amortizing Secured Note 5.69%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 6,197 6,709
4.45%, Amortizing Secured Note, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 9,827 10,267
4.47%, Amortizing Secured Note, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 3,646 3,810
State Revolving Trust Note, due July 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 2,075 2,191
State Revolving Trust Note, due February 1, 2036 [Member]    
SUBTOTAL LONG-TERM DEBT 1,115 1,115
State Revolving Trust Note, due November 30, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 1,090 1,154
Construction Loans [Member]    
SUBTOTAL LONG-TERM DEBT 3,874 7,470
First Mortgage Bonds - Series X [Member]    
SUBTOTAL LONG-TERM DEBT 55 107
First Mortgage Bonds - Series Y [Member]    
SUBTOTAL LONG-TERM DEBT 61 122
First Mortgage Bonds - Series Z [Member]    
SUBTOTAL LONG-TERM DEBT 224 335
First Mortgage Bonds - Series AA [Member]    
SUBTOTAL LONG-TERM DEBT 300 440
First Mortgage Bonds - Series BB [Member]    
SUBTOTAL LONG-TERM DEBT 482 603
First Mortgage Bonds - Series CC [Member]    
SUBTOTAL LONG-TERM DEBT 636 779
First Mortgage Bonds - Series EE [Member]    
SUBTOTAL LONG-TERM DEBT 2,296 2,713
First Mortgage Bonds - Series FF [Member]    
SUBTOTAL LONG-TERM DEBT 3,495 3,690
First Mortgage Bonds - Series GG [Member]    
SUBTOTAL LONG-TERM DEBT 813 903
First Mortgage Bonds - Series HH [Member]    
SUBTOTAL LONG-TERM DEBT 880 960
First Mortgage Bonds - Series II [Member]    
SUBTOTAL LONG-TERM DEBT 610 700
First Mortgage Bonds - Series JJ [Member]    
SUBTOTAL LONG-TERM DEBT 750 824
First Mortgage Bonds - Series KK [Member]    
SUBTOTAL LONG-TERM DEBT 988 1,078
First Mortgage Bonds - Series LL [Member]    
SUBTOTAL LONG-TERM DEBT 1,095 1,175
First Mortgage Bonds - Series MM [Member]    
SUBTOTAL LONG-TERM DEBT 1,237 1,337
First Mortgage Bonds - Series NN [Member]    
SUBTOTAL LONG-TERM DEBT 1,505 1,590
First Mortgage Bonds - Series OO [Member]    
SUBTOTAL LONG-TERM DEBT 2,107 2,258
First Mortgage Bonds - Series PP [Member]    
SUBTOTAL LONG-TERM DEBT 740 780
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 2,258 2,408
First Mortgage Bonds - Series UU [Member]    
SUBTOTAL LONG-TERM DEBT 845 890
First Mortgage Bonds - Series VV [Member]    
SUBTOTAL LONG-TERM DEBT 2,290 2,433
First Mortgage Bonds - Series WW [Member]    
SUBTOTAL LONG-TERM DEBT 830 865
First Mortgage Bonds - Series XX [Member]    
SUBTOTAL LONG-TERM DEBT 11,259
First Mortgage Bonds - Series YY [Member]    
SUBTOTAL LONG-TERM DEBT $ 3,860