Note 6 - Fair Value (Details Textual) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) $ / shares	Mar. 31, 2025 USD ($)	Jun. 30, 2022
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	$ 0	$ 0
Unrealized Gain (Loss) on Investments	(4,600)	(32,156)
Fair Value, Inputs, Level 3 [Member] \| Debt Securities [Member]
Unrealized Gain (Loss) on Investments	2,600	17,800
Fair Value, Inputs, Level 3 [Member] \| Warrant [Member]
Unrealized Gain (Loss) on Investments	$ 100	600
Fair Value, Inputs, Level 3 [Member] \| Equity Securities [Member]
Unrealized Gain (Loss) on Investments		$ 14,700
The 2026 Notes [Member]
Debt Instrument, Share Price (in dollars per share) \| $ / shares	$ 24.59
The 2026 Notes [Member] \| Fair Value, Inputs, Level 1 [Member]
Debt Instrument, Fair Value Disclosure	$ 56,600
The 2028 Notes [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Instrument, Fair Value Disclosure	57,200
The 2031 Convertible Notes [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Instrument, Fair Value Disclosure	2,700
The 2030 Convertible Notes [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Instrument, Fair Value Disclosure	$ 16,200
Measurement Input, Hypothetical Market Yields [Member]
Debt Instrument, Measurement Input			0.25