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Note 7 - Stockholders' Equity and Stock-based Compensation Expense (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	May 05, 2022	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	May 01, 2023	Mar. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)		$ 14.57		$ 14.57
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)		2 years 4 months 24 days
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 22,600,000		$ 22,600,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)		0	262,158	(0)	281,175
Proceeds from Stock Options Exercised			$ 889,000	$ 0	$ 953,000
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
Performance Shares [Member]
Share-Based Payment Arrangement, Nonvested Award, Excluding 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)			92,066		97,205
Proceeds from Stock Options Exercised			$ 0		$ 0
At-the-market Common Stock Offering [Member]
Equity Offering, Maximum Amount							$ 200,000,000	$ 100,000,000
Equity Offering, Percentage of Commission							3.00%
Stock Issued During Period, Shares, New Issues (in shares)		0		0

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