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Note 9 - Share-based Payment Awards (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	9 Months Ended	12 Months Ended
	Jan. 01, 2023	Dec. 31, 2018	Jul. 31, 2017	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2024	May 30, 2017
Common Stock, Capital Shares Reserved for Future Issuance, Increase (in shares)	1,014,124							1,027,522
Common Stock, Shares, Outstanding (in shares)					26,709,084	25,688,062	25,353,119
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					1,621,118
Share-Based Payment Arrangement, Expense					$ 3,165	$ 3,137	$ 4,218
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 1,867
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)					266,353	207,626	25,000
Proceeds from Stock Options Exercised					$ 1,191	$ 149	$ 35
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount					$ 5,390
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)					$ 2.2
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)					80,933	86,782	69,884
General and Administrative Expense [Member]
Share-Based Payment Arrangement, Expense					$ 2,899	$ 2,864	$ 3,954
Research and Development Expense [Member]
Share-Based Payment Arrangement, Expense					$ 266	273	$ 264
Consultant [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)					5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			50,000
Two Senior Executives [member]
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)							$ 1.37
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)							$ 8.61
Share-based Payment Arrangement, Plan Modification, Modification Expense							$ 104
Senior Executive [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)					$ 3.47
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)					$ 8.61
Share-based Payment Arrangement, Plan Modification, Modification Expense					$ 75
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)				10 years	10 years
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Expense					$ 241	239	114
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount					$ 740
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					2 years 2 months 12 days
The 2017 Plan [Member] \| Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)									5,000,000
The 2018 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)					692,581
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Share Reserve as a Percent of Outstanding Common Stock					4.00%
The 2018 Employee Stock Purchase Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)					692,581
Common Stock, Capital Shares Reserved for Future Issuance, Increase (in shares)		150,000
Share-Based Payment Arrangement, Expense					$ 205	135	$ 128
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 1.27				$ 1.35		$ 1.17
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		150,000
Common Stock, Capital Shares Reserved for Future Issuance, Percentage Increase		1.00%
Employee Stock Purchase Plans, Fair Value of Common Stock Price Per Share on Offering Date, Percentage		85.00%
Employee Stock Purchase Plans, Fair Value of Common Stock Price Per Share on Purchase Date, Percentage		85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)	86,782				80,933		69,884
Employee Stock Purchase Plan (ESPP), Cash Contributions to ESPP					$ 283	230	$ 174
Employee-related Liabilities, Current					$ 42	$ 24