Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 02, 2022	Jun. 30, 2022	Dec. 31, 2020	Sep. 05, 2019	Jul. 28, 2014
Preferred Stock, Shares Authorized (in shares)	10,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001
Common Stock, Shares Authorized (in shares)	175,000,000	175,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Proceeds from Issuance of Common Stock	$ 46,296	$ 0	$ 2,219
Treasury Stock, Common, Shares (in shares)	41,309	41,309
Treasury Stock, Value	$ 200
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	4,697,029	5,135,685	2,467,537			2,526,166
Share-Based Payment Arrangement, Expense	$ 37,900	$ 19,200	$ 61,300
Share-Based Payment Arrangement, Noncash Expense	37,933	$ 19,185	$ 61,274
Stock-based Compensation Expense Capitalized Into Inventory [Member]
Share-Based Payment Arrangement, Expense	$ 2,900
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	9,639,068	8,732,286	12,032,040			10,785,034
Share-Based Payment Arrangement, Noncash Expense	$ 34,100	$ 15,800	$ 58,400
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 27,800
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 8 months 12 days
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	$ 0
Share-Based Payment Arrangement, Noncash Expense	3,900	$ 3,300	$ 2,900
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 4,100
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 7 months 6 days
Milestone Based Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	2,470,770
The 2022 Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)					17,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	2,272,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	8,751,892
The 2022 Incentive Plan [Member] | Full Value Awards [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)					10,000,000
The 2022 Incentive Plan [Member] | Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	4,631,204
The 2012 Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	5,007,864
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	2,424,529
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	0
The 2020 Atm [Member]
Common Stock, Commission Rate							3.00%
The 2021 Atm [Member]
Stock Issued During Period, Shares, New Issues (in shares)			72,000
Proceeds from Issuance of Common Stock			$ 2,500
Share Price (in dollars per share)			$ 34.25
Proceeds from Issuance of Common Stock, Net			$ 2,400
The 2022 ATM [Member]
Common Stock, Commission Rate				3.00%
Stock Issued During Period, Shares, New Issues (in shares)	1,385,700
Proceeds from Issuance of Common Stock	$ 47,100
Share Price (in dollars per share)	$ 34.01
Proceeds from Issuance of Common Stock, Net	$ 46,300
Series A Junior Participating Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)								$ 0.001
Rights to Purchase Series A Junior Participating Preferred Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 100
Warrants to Purchase Common Stock, Loan agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	147,058
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 4.08
Warrants to Purchase Common Stock, Amended Loan Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	115,042
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 17.95
Warrants to Purchase Common Stock, First Amendment Loan Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	50,172
Warrants to Purchase Common Stock, First Amendment [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 14.7