Note 2 - Investments and Fair Value Measurements - Unrealized Loss Positions (Details) $ in Thousands	Jun. 30, 2026 USD ($)
Investments, fair value, 12 months or less	$ 298,227
Investments, unrealized loss, 12 months or less	(1,914)
Investments, fair value, 12 months or longer	0
Investments, unrealized loss, 12 months or longer	0
Investments, unrealized loss, fair value	298,227
Investments, unrealized loss	(1,914)
Certificates of Deposit [Member]
Investments, fair value, 12 months or less	7,846
Investments, unrealized loss, 12 months or less	(34)
Investments, fair value, 12 months or longer	0
Investments, unrealized loss, 12 months or longer	0
Investments, unrealized loss, fair value	7,846
Investments, unrealized loss	(34)
US Treasury Securities [Member]
Investments, fair value, 12 months or less	238,347
Investments, unrealized loss, 12 months or less	(1,359)
Investments, fair value, 12 months or longer	0
Investments, unrealized loss, 12 months or longer	0
Investments, unrealized loss, fair value	238,347
Investments, unrealized loss	(1,359)
Corporate Bond Securities [Member]
Investments, fair value, 12 months or less	52,034
Investments, unrealized loss, 12 months or less	(521)
Investments, fair value, 12 months or longer	0
Investments, unrealized loss, 12 months or longer	0
Investments, unrealized loss, fair value	52,034
Investments, unrealized loss	$ (521)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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