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Note 7 - Revenue - Electric Operations (Details) - Electric Operations [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Delivered energy (including contract liability amortization)	$ 56,846	$ 71,017	$ 115,601	$ 163,409
Delivered Energy [Member]
Delivered energy (including contract liability amortization)	39,973	53,862	86,955	130,284
Energy Capacity [Member]
Delivered energy (including contract liability amortization)	$ 16,873	$ 17,155	$ 28,646	$ 33,125

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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