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Note 2 - Segment Information - Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Total Operating Revenues	$ 234,747	$ 245,972
Interest charges	8,123	7,826
Income Taxes	5,638	5,628
Net Income (Loss)	24,268	26,324
Assets	2,306,002		$ 2,273,595
Operating Segments [Member] | Electric [Member]
Regulated operating revenues	119,876	128,109
Interest charges	7,384	6,641
Income Taxes	3,620	4,771
Net Income (Loss)	16,182	18,700
Assets	1,955,465		1,931,525
Operating Segments [Member] | Electric [Member] | Retail [Member]
Revenue from Contracts with Customers	106,690	114,955
Changes in Accrued ARP Revenues	(87)	(1,049)
Regulated operating revenues	106,603	113,906
Operating Segments [Member] | Electric [Member] | Electric Transmission [Member]
Revenue from Contracts with Customers	10,841	10,862
Operating Segments [Member] | Electric [Member] | Wholesale [Member]
Revenue from Contracts with Customers	876	1,527
Operating Segments [Member] | Electric [Member] | Product and Service, Other [Member]
Revenue from Contracts with Customers	1,556	1,814
Operating Segments [Member] | Manufacturing [Member]
Revenue from Contracts with Customers	68,479	77,822
Interest charges	554	584
Income Taxes	1,461	1,454
Net Income (Loss)	4,927	4,842
Assets	201,892		195,742
Operating Segments [Member] | Manufacturing [Member] | Metal Parts and Tooling [Member]
Revenue from Contracts with Customers	57,211	66,724
Operating Segments [Member] | Manufacturing [Member] | Plastic Products [Member]
Revenue from Contracts with Customers	9,883	9,045
Operating Segments [Member] | Manufacturing [Member] | Manufactured Product, Other [Member]
Revenue from Contracts with Customers	1,385	2,053
Operating Segments [Member] | Plastics [Member]
Revenue from Contracts with Customers	46,397	40,058
Interest charges	148	149
Income Taxes	1,917	1,329
Net Income (Loss)	5,449	3,729
Assets	102,654		92,049
Corporate and Eliminations [Member]
Interest charges	37	452
Income Taxes	(1,360)	(1,926)
Net Income (Loss)	(2,290)	(947)
Assets	45,991		$ 54,279
Intersegment Eliminations [Member]
Regulated operating revenues	$ (5)	$ (17)

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