Note 6 - Composition of Certain Financial Statement Captions - Summary of Allowance for Doubtful Accounts, Inventory Reserve and Tax Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Valuation Allowances and Reserves, Amount	$ (4,162)	$ (1,839)
Charge to Cost and Expense	(247)	(304)
Deduction	2,408	(2,019)
Charge to Other Account	0	0
Valuation Allowances and Reserves, Amount	(2,000)	(4,162)
SEC Schedule, 12-09, Reserve, Inventory [Member]
Valuation Allowances and Reserves, Amount	(3,574)	(4,779)
Charge to Cost and Expense	(8,100)	(4,059)
Deduction	5,213	5,264
Charge to Other Account	0	0
Valuation Allowances and Reserves, Amount	(6,461)	(3,574)
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Valuation Allowances and Reserves, Amount	(279,212)	(260,397)
Charge to Cost and Expense	(11,128)	(24,579)
Deduction	0	0
Charge to Other Account	(4,223)	5,764
Valuation Allowances and Reserves, Amount	$ (294,563)	$ (279,212)