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CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2021
Common Stock, No Par Value    
Shares Authorized
Shares Outstanding - 2023 - 17,671; 2022 - 17,642 235,756 233,054
Retained Earnings 167,599 167,274
TOTAL COMMON EQUITY 403,355 400,328
Cumulative Preferred Stock, No Par Value:    
Shares Authorized
Shares Outstanding
Convertible:    
TOTAL PREFERRED STOCK 2,084 2,084
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 345,803 306,387
Add: Premium on Issuance of Long-term Debt 6,776 6,873
Less: Unamortized Debt Expense (5,494) (5,518)
Less: Current Portion of Long-term Debt (17,449) (17,462)
TOTAL LONG-TERM DEBT 329,636 290,280
First Mortgage Bonds    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 291,496 252,269
First Mortgage Bonds due 2023-2059    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 44,244 44,918
State Revolving Trust Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 10,063 9,200
Convertible Preferred Stock $7.00 Series    
Convertible:    
TOTAL PREFERRED STOCK 1,005 1,005
Nonredeemable Preferred Stock $7.00 Series    
Convertible:    
TOTAL PREFERRED STOCK 79 79
Nonredeemable Preferred Stock $4.75 Series    
Convertible:    
TOTAL PREFERRED STOCK $ 1,000 $ 1,000