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Note 7 - Stockholders' Equity and Stock-based Compensation (Details Textual) - USD ($)			12 Months Ended
	Nov. 22, 2022	May 05, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	May 01, 2023
Proceeds from Issuance of Common Stock			$ 0	$ 0	$ 47,329,000
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.001	$ 0.001
Stock Options Exercised Net Settled Satisfaction Of Exercise Price (in shares)			6,634
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)			418,854
Share-Based Payment Arrangement, Expense			$ 16,291,000	$ 4,586,000	2,066,000
Employee Severance [Member]
Share-Based Payment Arrangement, Expense			$ 600,000	$ 0	$ 0
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate			0.00%	0.00%	0.00%
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			$ 50,600,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 3 months 18 days
Performance Shares [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount					$ 101,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Expirations (in shares)					57,143
Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)			6,500
The 2018 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)		10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)		5,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001
The 2022 Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,666,667
Shares Issued, Price Per Share (in dollars per share)	$ 30
Proceeds from Issuance of Common Stock	$ 47,300,000
At-the-market Common Stock Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)			0	0
Equity Offering, Maximum Amount						$ 200,000,000
Equity Offering, Percentage of Commission						3.00%

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