Note 6 - Convertible Senior Notes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Proceeds from Convertible Debt	$ 0	$ 393,518
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Interest Expense, Operating and Nonoperating	$ 3,060	$ 3,171
Reclassified From Construction in Progress to Assets Placed in Service [Member]
Interest Costs Capitalized	0	0
March 2023 Note [Member] \| Convertible Senior Notes [Member]
Debt Instrument, Face Amount		$ 402,500
Debt Instrument, Interest Rate, Stated Percentage		3.00%
Proceeds from Convertible Debt		$ 391,492
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		130.00%
Debt Instrument, Convertible, Conversion Ratio		14.3516
Debt Instrument, Convertible, Conversion Price (in dollars per share)		$ 69.68
Debt Instrument, Convertible, Threshold Trading Days		20
Debt Instrument, Convertible, Threshold Consecutive Trading Days		30
Debt Instrument, Redemption Price, Percentage		100.00%
Debt Instrument, Interest Rate, Effective Percentage		3.59%
Debt Issuance Costs, Net		$ 11,008
Unamortized Debt Issuance Expense	8,912
Interest Payable	0
Interest Expense, Operating and Nonoperating	3,019
Interest Costs Capitalized	$ 1,045
March 2023 Note [Member] \| Convertible Senior Notes [Member] \| Minimum [Member]
Debt Instrument, Redemption, Minimum Aggregate Principal Outstanding		$ 100,000

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of interest capitalized during the period.

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Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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