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Note 6 - Stockholders' Equity and Stock-based Compensation Expense (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	May 05, 2022	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)		$ 15,590,000		$ 15,590,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)				2 years 6 months
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 30,600,000		$ 30,600,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)		225,209
Stock Options Exercised Net Settled Satisfaction Of Exercise Price (in shares)				120,492
Proceeds from Stock Options Exercised				$ 90,000	$ 0
Share-based Compensation Expense, Estimated Forfeitures		$ 600,000	$ 0	$ 200,000
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001		$ 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
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 100,000		$ 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)		0		225,209
Proceeds from Stock Options Exercised				$ 0

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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