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Note 6 - Supplemental Balance Sheet and Cash Flow Information - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accrued costs of construction, including capitalized interest $ 13,469 $ 5,769
Accrued costs of long-lived assets 639 0
Proceeds receivable from exercise of warrants 0 1,444
Debt issuance costs and premium amortized to cost of construction 49 51
Right-of-use assets obtained in exchange for operating lease liabilities 2,373 46,422
Net increase in right-of-use assets and operating lease liabilities due to lease remeasurement 0 70
Interest paid 3,608 3,664
Cash, beginning of year 42,442 60,257
Restricted cash, beginning of year 51,917 12,009
Cash and restricted cash, beginning of year 94,359 72,266
Cash, end of period 51,134 2,556
Restricted cash, end of period 32,516 99,453
Cash and restricted cash, end of period $ 83,650 $ 102,009