Note 7 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 10, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Common Stock, Shares Authorized (in shares)		50,000,000	50,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001	$ 0.001
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)		266,353	207,626	25,000
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)			50,867
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 180
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)		80,933	86,782	69,884
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		90,402	91,402	0
Securities Purchase Agreements [Member]
Stock Issued During Period, Shares, New Issues (in shares)	583,334
Shares Issued, Price Per Share (in dollars per share)	$ 12
Proceeds from Issuance of Common Stock	$ 7,000
The Two Thousand Eighteen Equity Incentive Plan Member
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)		266,353	207,626	25,000
The Two Thousand Eighteen Equity Incentive Plan Member | Cashless Stock Awards [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)		407,808