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Note 2 - Segment Information - Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Total Operating Revenues $ 192,756 $ 229,203 $ 427,503 $ 475,175  
Interest charges 8,662 7,825 16,785 15,651  
Income Taxes 3,808 3,343 9,446 8,971  
Net Income (Loss) 16,981 15,426 41,249 41,750  
Assets 2,389,239   2,389,239   $ 2,273,595
Operating Segments [Member] | Electric [Member]          
Regulated operating revenues 98,153 102,244 218,029 230,353  
Interest charges 7,348 6,625 14,732 13,266  
Income Taxes 2,579 1,037 6,199 5,808  
Net Income (Loss) 13,306 7,502 29,488 26,202  
Assets 2,054,523   2,054,523   1,931,525
Operating Segments [Member] | Electric [Member] | Retail [Member]          
Revenue from Contracts with Customers 85,344 87,976 192,034 202,931  
Changes in Accrued ARP Revenues 209 369 122 (680)  
Regulated operating revenues 85,553 88,345 192,156 202,251  
Operating Segments [Member] | Electric [Member] | Electric Transmission [Member]          
Revenue from Contracts with Customers 9,673 11,469 20,514 22,331  
Operating Segments [Member] | Electric [Member] | Wholesale [Member]          
Revenue from Contracts with Customers 765 941 1,641 2,468  
Operating Segments [Member] | Electric [Member] | Product and Service, Other [Member]          
Revenue from Contracts with Customers 2,162 1,489 3,718 3,303  
Operating Segments [Member] | Manufacturing [Member]          
Revenue from Contracts with Customers 45,948 73,496 114,427 151,318  
Interest charges 554 646 1,108 1,230  
Income Taxes (189) 1,149 1,272 2,603  
Net Income (Loss) 238 3,990 5,165 8,832  
Assets 184,462   184,462   195,742
Operating Segments [Member] | Manufacturing [Member] | Metal Parts and Tooling [Member]          
Revenue from Contracts with Customers 37,267 62,541 94,478 129,265  
Operating Segments [Member] | Manufacturing [Member] | Plastic Products [Member]          
Revenue from Contracts with Customers 7,840 9,353 17,723 18,398  
Operating Segments [Member] | Manufacturing [Member] | Manufactured Product, Other [Member]          
Revenue from Contracts with Customers 841 1,602 2,226 3,655  
Operating Segments [Member] | Plastics [Member]          
Revenue from Contracts with Customers 48,679 53,476 95,076 93,534  
Interest charges 186 215 334 364  
Income Taxes 1,818 2,044 3,735 3,373  
Net Income (Loss) 5,130 5,792 10,579 9,521  
Assets 102,285   102,285   92,049
Corporate, Non-Segment [Member]          
Interest charges 574 339 611 791  
Income Taxes (400) (887) (1,760) (2,813)  
Net Income (Loss) (1,693) (1,858) (3,983) (2,805)  
Assets 47,969   47,969   $ 54,279
Intersegment Eliminations [Member]          
Regulated operating revenues $ (24) $ (13) $ (29) $ (30)