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Note 2 - Business Segment Information - Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Total $ 919,503 $ 916,447 $ 849,350
Cost of Products Sold 355,119 354,559 316,562
Other Nonelectric Expenses 50,782 51,544 41,492
Depreciation and amortization 78,086 74,666 72,545
Operating income (loss) 134,880 129,389 132,287
Interest charges 31,411 30,408 29,604
Total 17,441 14,588 27,256
Net income (loss) 86,847 82,345 72,439
Capital expenditures 207,365 105,425 132,913
Identifiable Assets 2,273,595 2,052,517 2,004,278
Corporate, Non-Segment [Member]      
Other Nonelectric Expenses 9,515 9,607 6,182
Depreciation and amortization 330 218 73
Operating income (loss) (9,845) (9,825) (6,255)
Interest charges 1,800 1,204 1,422
Total (5,519) (3,218) 1,806
Net income (loss) (5,670) (8,744) (9,753)
Capital expenditures 283 623 121
Identifiable Assets 54,279 44,797 59,801
Intersegment Eliminations [Member]      
Regulated operating revenues (55) (57) (57)
Cost of Products Sold (34) (21) (18)
Other Nonelectric Expenses (21) (36) (39)
Electric [Member] | Operating Segments [Member]      
Regulated operating revenues 459,097 450,255 434,537
Depreciation and amortization 60,044 55,935 53,276
Operating income (loss) 98,417 88,031 94,797
Interest charges 26,548 26,365 25,334
Total 12,867 5,685 17,013
Net income (loss) 59,046 54,431 49,446
Capital expenditures 187,362 87,287 118,444
Identifiable Assets 1,931,525 1,728,534 1,690,224
Electric [Member] | Operating Segments [Member] | Retail [Member]      
Revenue from Contracts with Customers 405,446 388,690 376,902
Changes in Accrued ARP Revenues 1,032 (439) (1,971)
Regulated operating revenues 406,478 388,251 374,931
Electric [Member] | Operating Segments [Member] | Electric Transmission [Member]      
Revenue from Contracts with Customers 40,542 46,947 46,664
Electric [Member] | Operating Segments [Member] | Wholesale [Member]      
Revenue from Contracts with Customers 5,007 7,735 5,173
Electric [Member] | Operating Segments [Member] | Product and Service, Other [Member]      
Revenue from Contracts with Customers 7,070 7,322 7,769
Manufacturing [Member] | Operating Segments [Member]      
Revenue from Contracts with Customers 277,204 268,409 229,738
Cost of Products Sold 215,179 205,699 176,473
Other Nonelectric Expenses 29,895 29,650 23,785
Depreciation and amortization 14,261 14,794 15,379
Operating income (loss) 17,869 18,266 14,101
Interest charges 2,345 2,230 2,215
Total 2,784 3,393 989
Net income (loss) 12,899 12,839 11,050
Capital expenditures 14,268 13,316 9,916
Identifiable Assets 195,742 187,556 167,023
Manufacturing [Member] | Operating Segments [Member] | Metal Parts and Tooling [Member]      
Revenue from Contracts with Customers 236,032 223,765 189,242
Manufacturing [Member] | Operating Segments [Member] | Plastic Products [Member]      
Revenue from Contracts with Customers 35,173 35,836 33,939
Manufacturing [Member] | Operating Segments [Member] | Manufactured Product, Other [Member]      
Revenue from Contracts with Customers 5,999 8,808 6,557
Plastics [Member] | Operating Segments [Member]      
Revenue from Contracts with Customers 183,257 197,840 185,132
Cost of Products Sold 139,974 148,881 140,107
Other Nonelectric Expenses 11,393 12,323 11,564
Depreciation and amortization 3,451 3,719 3,817
Operating income (loss) 28,439 32,917 29,644
Interest charges 718 609 633
Total 7,309 8,728 7,448
Net income (loss) 20,572 23,819 21,696
Capital expenditures 5,452 4,199 4,432
Identifiable Assets $ 92,049 $ 91,630 $ 87,230