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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Common Stock, No Par Value $ 215,600 $ 215,125
Retained Earnings 111,800 108,667
TOTAL COMMON EQUITY 327,400 323,792
TOTAL PREFERRED STOCK 2,084 2,084
SUBTOTAL LONG-TERM DEBT 238,466 234,397
Add: Premium on Issuance of Long-term Debt 7,964 8,064
Less: Unamortized Debt Expense (4,470) (4,506)
Less: Current Portion of Long-term Debt (7,171) (7,178)
TOTAL LONG-TERM DEBT 234,789 230,777
Amortizing Secured Note, due December 20, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 569 643
Amortizing Secured Note, due May 19, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 3,430 3,535
Amortizing Secured Note, due August 25, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 2,917 2,987
Amortizing Secured Note, due September 19, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 3,197 3,267
State Revolving Trust Note, due December 31, 2022 [Member]    
SUBTOTAL LONG-TERM DEBT 175 175
State Revolving Trust Note, due May 1, 2025 [Member]    
SUBTOTAL LONG-TERM DEBT 1,405 1,405
State Revolving Trust Note, due March 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 288 309
State Revolving Trust Note, due January 25, 2027 [Member]    
SUBTOTAL LONG-TERM DEBT 328 349
State Revolving Trust Note, due December 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 447 446
State Revolving Trust Bond 4.00% to 5.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 60 60
State Revolving Trust Bond 0.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 48 50
State Revolving Trust Note, due July 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 214 214
State Revolving Trust Note, due January 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 69 69
State Revolving Trust Note, due August 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 822 851
Amortizing Secured Note, due April 20, 2029 [Member]    
SUBTOTAL LONG-TERM DEBT 3,168 3,255
Amortizing Secured Note 7.05%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 2,458 2,521
Amortizing Secured Note 5.69%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 5,043 5,171
Amortizing Secured Note, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 8,837 8,946
Amortizing Secured Note, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 3,279 3,320
State Revolving Trust Note, due July 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 1,829 1,829
State Revolving Trust Note, due February 1, 2036 [Member]    
SUBTOTAL LONG-TERM DEBT 987 1,013
State Revolving Trust Note, due November 1, 2038 [Member]    
SUBTOTAL LONG-TERM DEBT 1,539 1,309
State Revolving Trust Note, due November 30, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 955 955
Construction Loans [Member]    
SUBTOTAL LONG-TERM DEBT 45,635 40,467
First Mortgage Bonds - Series BB [Member]    
SUBTOTAL LONG-TERM DEBT 235 241
First Mortgage Bonds - Series CC [Member]    
SUBTOTAL LONG-TERM DEBT 331 331
First Mortgage Bonds - Series EE [Member]    
SUBTOTAL LONG-TERM DEBT 1,407 1,456
First Mortgage Bonds - Series FF [Member]    
SUBTOTAL LONG-TERM DEBT 2,440 2,440
First Mortgage Bonds - Series GG [Member]    
SUBTOTAL LONG-TERM DEBT 621 632
First Mortgage Bonds - Series HH [Member]    
SUBTOTAL LONG-TERM DEBT 710 710
First Mortgage Bonds - Series II [Member]    
SUBTOTAL LONG-TERM DEBT 416 429
First Mortgage Bonds - Series JJ [Member]    
SUBTOTAL LONG-TERM DEBT 588 588
First Mortgage Bonds - Series KK [Member]    
SUBTOTAL LONG-TERM DEBT 791 807
First Mortgage Bonds - Series LL [Member]    
SUBTOTAL LONG-TERM DEBT 928 928
First Mortgage Bonds - Series MM [Member]    
SUBTOTAL LONG-TERM DEBT 1,003 1,037
First Mortgage Bonds - Series NN [Member]    
SUBTOTAL LONG-TERM DEBT 1,190 1,190
First Mortgage Bonds - Series OO [Member]    
SUBTOTAL LONG-TERM DEBT 1,756 1,806
First Mortgage Bonds - Series PP [Member]    
SUBTOTAL LONG-TERM DEBT 660 660
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 1,906 1,957
First Mortgage Bonds - Series UU [Member]    
SUBTOTAL LONG-TERM DEBT 755 755
First Mortgage Bonds - Series VV [Member]    
SUBTOTAL LONG-TERM DEBT 1,956 2,004
First Mortgage Bonds - Series WW [Member]    
SUBTOTAL LONG-TERM DEBT 755 755
First Mortgage Bonds - Series XX [Member]    
SUBTOTAL LONG-TERM DEBT 10,500 10,627
First Mortgage Bonds - Series YY [Member]    
SUBTOTAL LONG-TERM DEBT 3,785 3,785
0.00%, Series 2018A, due August 1, 2047 [Member]    
SUBTOTAL LONG-TERM DEBT 6,599 6,678
3.00%-5.00%, Series 2018B, due August 1, 2047 [Member]    
SUBTOTAL LONG-TERM DEBT 2,320 2,320
4.00%, Series 2019A, due August 1, 2059 [Member]    
SUBTOTAL LONG-TERM DEBT 32,500 32,500
5.00%, Series 2019B, due August 1, 2059 [Member]    
SUBTOTAL LONG-TERM DEBT 21,200 21,200
Convertible Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 1,005 1,005
Nonredeemable Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 79 79
Nonredeemable Preferred Stock $4.75 Series [Member]    
TOTAL PREFERRED STOCK $ 1,000 $ 1,000