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Note 6 - Stockholders' Equity and Stock-based Compensation Expense (Details Textual) - USD ($)		1 Months Ended	3 Months Ended
	May 05, 2022	May 08, 2025	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	May 01, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)			$ 22.95
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)			2 years 2 months 12 days
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount			$ 31,800,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)			225,209
Proceeds from Stock Options Exercised			$ 90,000	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			0
Share-based Compensation Expense, Estimated Forfeitures			$ 800,000	$ 0
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.001		$ 0.001
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
Subsequent Event [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		1,300,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)		$ 1.44
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		4 years
Subsequent Event [Member] | Vesting Each Year [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%
Subsequent Event [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		1 year
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount			$ 100,000
Stock Options Net Settled in Satisfaction of the Exercise Price [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)			120,492
Proceeds from Stock Options Exercised			$ 0
At-the-market Common Stock Offering [Member]
Equity Offering, Maximum Amount						$ 200,000,000
Equity Offering, Percentage of Commission						3.00%
Stock Issued During Period, Shares, New Issues (in shares)			0	0

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