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Note 2 - Segment Information - Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Total $ 235,755 $ 228,652 $ 663,258 $ 703,827  
Interest charges 8,568 7,539 25,353 23,190  
Income Taxes 9,097 4,936 18,543 13,907  
Net Income (Loss) 35,934 24,745 77,183 66,495  
Assets 2,534,507   2,534,507   $ 2,273,595
Operating Segments [Member] | Electric [Member]          
Regulated operating revenues 115,223 114,373 333,252 344,726  
Interest charges 7,334 6,300 22,066 19,566  
Income Taxes 6,048 4,066 12,247 9,874  
Net Income (Loss) 24,737 17,682 54,225 43,884  
Assets 2,191,215   2,191,215   1,931,525
Operating Segments [Member] | Electric [Member] | Retail [Member]          
Revenue from Contracts with Customers 96,827 100,345 288,861 303,276  
Changes in Accrued ARP Revenues 2,778 (921) 2,900 (1,601)  
Regulated operating revenues 99,605 99,424 291,761 301,675  
Operating Segments [Member] | Electric [Member] | Electric Transmission [Member]          
Revenue from Contracts with Customers 12,288 11,692 32,802 34,023  
Operating Segments [Member] | Electric [Member] | Wholesale [Member]          
Revenue from Contracts with Customers 1,500 1,631 3,141 4,099  
Operating Segments [Member] | Electric [Member] | Product and Service, Other [Member]          
Revenue from Contracts with Customers 1,830 1,626 5,548 4,929  
Operating Segments [Member] | Manufacturing [Member]          
Revenue from Contracts with Customers 59,849 65,722 174,276 217,040  
Interest charges 553 561 1,661 1,791  
Income Taxes 891 285 2,163 2,888  
Net Income (Loss) 3,311 3,155 8,476 11,987  
Assets 189,525   189,525   195,742
Operating Segments [Member] | Manufacturing [Member] | Metal Parts and Tooling [Member]          
Revenue from Contracts with Customers 50,957 56,255 145,435 185,520  
Operating Segments [Member] | Manufacturing [Member] | Plastic Products [Member]          
Revenue from Contracts with Customers 7,600 8,088 25,323 26,486  
Operating Segments [Member] | Manufacturing [Member] | Manufactured Product, Other [Member]          
Revenue from Contracts with Customers 1,292 1,379 3,518 5,034  
Operating Segments [Member] | Plastics [Member]          
Revenue from Contracts with Customers 60,693 48,566 155,769 142,100  
Interest charges 163 197 497 561  
Income Taxes 3,638 1,914 7,373 5,287  
Net Income (Loss) 10,343 5,397 20,922 14,918  
Assets 104,661   104,661   92,049
Corporate, Non-Segment [Member]          
Interest charges 518 481 1,129 1,272  
Income Taxes (1,480) (1,329) (3,240) (4,142)  
Net Income (Loss) (2,457) (1,489) (6,440) (4,294)  
Assets 49,106   49,106   $ 54,279
Intersegment Eliminations [Member]          
Regulated operating revenues $ (10) $ (9) $ (39) $ (39)