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Note 13 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands				1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 15, 2025	Jan. 29, 2025	Jan. 06, 2025 $ / shares shares	Apr. 30, 2024 shares	Jul. 31, 2023	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares	Dec. 31, 2024 shares	Mar. 31, 2020 shares
Chief Financial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			26,315
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) \| $ / shares			$ 10.07
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								160,360
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) \| $ / shares								$ 6.34
Share-Based Payment Arrangement, Option [Member] \| Chief Financial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)			36 months
Non-plan Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								26,315
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares								$ 7.92	$ 99.33
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) \| $ / shares								$ 10.07
Non-plan Options [Member] \| Chief Financial Officer [Member]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) \| $ / shares			$ 10.07
Non-plan Options [Member] \| Chief Financial Officer [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)			3 years
Restricted Stock [Member]
Share-Based Payment Arrangement, Expense \| $						$ 70	$ 17	$ 259	$ 36
Employee Stock Purchase Plan 2018 [Member]
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)				5
Inducement Equity Incentive Plan 2020 [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)						0		0		0	3
Equity Incentive Plan 2023 [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)						161,848		161,848		48,790
Shares Available for Issuance, Quarterly Increase, Percentage of Common Shares Outstanding on Adjustment Date Less Fiscal Quarter Beginning Balance		10.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares								$ 4.41	$ 75.69
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								140,373
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Employee [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)								5 years
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Nonemployee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								19,987
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Nonemployee [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								11,832
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Nonemployee [Member] \| Share-Based Payment Arrangement, Tranche Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								8,155
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Nonemployee [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)								2 years
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Option [Member] \| Employees and Consultants [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					5 years
Equity Incentive Plan 2023 [Member] \| Non-plan Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			26,315
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	19							19