Note 4 - Investments and Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Equity Securities without Readily Determinable Fair Value, Amount	$ 198,400	$ 198,400	$ 195,300
Equity Method Investments	28,300	28,300	27,000
Provision for Credit Loss on Investments	0	0
Registered Investment Companies [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Investments, Fair Value Disclosure	$ 1,200	$ 1,200	$ 1,200

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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