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Note 11 - Convertible Senior Notes (Details Textual) - USD ($)		12 Months Ended
	Jun. 17, 2021	Dec. 31, 2021	Dec. 31, 2020	Nov. 30, 2005
Gain (Loss) on Extinguishment of Debt, Total		$ (29,439,000)	$ (0)
Bear Stearns [Member]
Loaned Shares Returned and Retired (in shares)		5,677,950
Conversion of Convertible Senior Notes to Common Stock [Member]
Debt Conversion, Original Debt, Amount	$ 11,800,000
Unsecured Convertible Senior Notes [Member]
Debt Instrument, Face Amount				$ 300,000,000.0
Convertible Senior Note [Member]
Extinguishment of Debt, Amount		$ 22,100,000
Repayments of Convertible Debt	12,100,000	30,400,000
Gain (Loss) on Extinguishment of Debt, Total	(15,300,000)	$ (14,100,000)
Debt Instrument, Convertible, Cash Paid Per $1,000 Principal Held	$ 1,000

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- Definition

The amount of cash to be paid per $1,000 of principal held of convertible debt instruments, upon conversion.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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