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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Common Stock, No Par Value $ 153,506 $ 153,045
Retained Earnings 66,354 65,392
TOTAL COMMON EQUITY 219,860 218,437
TOTAL PREFERRED STOCK 2,436 2,436
SUBTOTAL LONG-TERM DEBT 144,100 142,489
Add: Premium on Issuance of Long-term Debt 1,442 1,495
Less: Unamortized Debt Expense (3,238) (3,287)
Less: Current Portion of Long-term Debt (6,148) (6,159)
TOTAL LONG-TERM DEBT 136,156 134,538
Amortizing Secured Note, due December 20, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 1,358 1,415
Amortizing Secured Note, due May 19, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 4,690 4,795
Amortizing Secured Note, due August 25, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 3,757 3,827
Amortizing Secured Note, due September 19, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 4,037 4,107
State Revolving Trust Note, due December 31, 2022 [Member]    
SUBTOTAL LONG-TERM DEBT 329 329
State Revolving Trust Note, due May 1, 2025 [Member]    
SUBTOTAL LONG-TERM DEBT 2,063 2,062
State Revolving Trust Note, due March 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 411 431
State Revolving Trust Note, due January 25, 2027 [Member]    
SUBTOTAL LONG-TERM DEBT 446 465
State Revolving Trust Note, due December 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 603 603
State Revolving Trust Bond 4.00% to 5.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 213 213
State Revolving Trust Bond 0.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 162 166
State Revolving Trust Note, due July 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 275 276
State Revolving Trust Note, due January 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 91 91
State Revolving Trust Note, due August 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 989 1,015
Amortizing Secured Note, due April 20, 2029 [Member]    
SUBTOTAL LONG-TERM DEBT 4,215 4,302
Amortizing Secured Note 7.05%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 3,208 3,271
Amortizing Secured Note 5.69%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 6,581 6,709
Amortizing Secured Note 4.45%, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 10,156 10,266
Amortizing Secured Note 4.47%, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 3,769 3,810
State Revolving Trust Note, due July 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 2,191 2,191
State Revolving Trust Note, due November 30, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 1,154 1,154
Construction Loans [Member]    
SUBTOTAL LONG-TERM DEBT 10,209 7,470
First Mortgage Bonds - Series X [Member]    
SUBTOTAL LONG-TERM DEBT 105 107
First Mortgage Bonds - Series Y [Member]    
SUBTOTAL LONG-TERM DEBT 122 122
First Mortgage Bonds - Series Z [Member]    
SUBTOTAL LONG-TERM DEBT 329 336
First Mortgage Bonds - Series AA [Member]    
SUBTOTAL LONG-TERM DEBT 440 440
First Mortgage Bonds - Series BB [Member]    
SUBTOTAL LONG-TERM DEBT 590 603
First Mortgage Bonds - Series CC [Member]    
SUBTOTAL LONG-TERM DEBT 779 779
First Mortgage Bonds - Series EE [Member]    
SUBTOTAL LONG-TERM DEBT 2,641 2,713
First Mortgage Bonds - Series FF [Member]    
SUBTOTAL LONG-TERM DEBT 3,690 3,690
First Mortgage Bonds - Series GG [Member]    
SUBTOTAL LONG-TERM DEBT 887 903
First Mortgage Bonds - Series HH [Member]    
SUBTOTAL LONG-TERM DEBT 960 960
First Mortgage Bonds - Series II [Member]    
SUBTOTAL LONG-TERM DEBT 683 700
First Mortgage Bonds - Series JJ [Member]    
SUBTOTAL LONG-TERM DEBT 824 824
First Mortgage Bonds - Series KK [Member]    
SUBTOTAL LONG-TERM DEBT 1,058 1,078
First Mortgage Bonds - Series LL [Member]    
SUBTOTAL LONG-TERM DEBT 1,175 1,175
First Mortgage Bonds - Series MM [Member]    
SUBTOTAL LONG-TERM DEBT 1,304 1,337
First Mortgage Bonds - Series NN [Member]    
SUBTOTAL LONG-TERM DEBT 1,590 1,590
First Mortgage Bonds - Series OO [Member]    
SUBTOTAL LONG-TERM DEBT 2,207 2,258
First Mortgage Bonds - Series PP [Member]    
SUBTOTAL LONG-TERM DEBT 780 780
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 2,358 2,408
First Mortgage Bonds - Series UU [Member]    
SUBTOTAL LONG-TERM DEBT 890 890
First Mortgage Bonds - Series VV [Member]    
SUBTOTAL LONG-TERM DEBT 2,386 2,433
First Mortgage Bonds - Series WW [Member]    
SUBTOTAL LONG-TERM DEBT 865 865
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
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
State Revolving Trust Note, due February 1, 2036 [Member]    
TOTAL PREFERRED STOCK $ 1,115 $ 1,115