Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Receivables, Net
Reserve for uncollectible accounts receivable	$ 8,578	$ 6,905
Reserve for uncollectible other accounts receivable	$ 2,084	$ 2,124
Common shareholders' equity
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	36,542,000	36,490,000
Common stock, shares outstanding	36,542,000	36,490,000
MGE [Member]
Receivables, Net
Reserve for uncollectible accounts receivable	$ 8,578	$ 6,905
Reserve for uncollectible other accounts receivable	$ 2,084	$ 2,124
Common shareholders' equity
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares outstanding	17,348,000	17,348,000