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Note 13 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 29, 2025	Jan. 06, 2025	Jul. 31, 2023	Sep. 30, 2018	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Mar. 31, 2020
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)					1,641,184		70,605
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					1,627,500
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.42
Non-plan Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)					525,000		25,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					500,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.53
Non-plan Options [Member] \| Chief Financial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		36 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		500,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)		$ 0.53
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					$ 91	$ 6
2018 Equity Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)			0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)							7
Employee Stock Purchase Plan 2018 [Member]
Employee Stock Purchase Plan, Maximum Employee Election Threshold, Percentage				15.00%
Employee Stock Purchase Plan, Percentage of Fair Value Common Stock Price				85.00%
Employee Stock Purchase Plan, Contingency, Maximum Shares to Increase Stock Reserved for Issuance (in shares)				23
Employee Stock Purchase Plan, Contingency, Percentage of Total Shares Outstanding				1.25%
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)					95
Inducement Equity Incentive Plan 2020 [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)					0		0	64
Equity Incentive Plan 2023 [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)					880,365		926,882
Shares Available for Issuance, Quarterly Increase, Percentage of Common Shares Outstanding on Adjustment Date Less Fiscal Quarter Beginning Balance							10.00%
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)	300,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.42
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Nonemployee [Member] \| Share-Based Payment Arrangement, Tranche One [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, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	450,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.42
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares)	0
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Employee [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	225,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	20.00%
Equity Incentive Plan 2023 [Member] \| Share-Based Payment Arrangement, Employee [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	225,000
Equity Incentive Plan 2023 [Member] \| Employees and Consultants [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	172,500
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.42
Share-Based Compensation, Percent of Vested Shares	75.00%
Equity Incentive Plan 2023 [Member] \| Employees and Consultants [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	20.00%
Equity Incentive Plan 2023 [Member] \| Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	450,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.42
Equity Incentive Plan 2023 [Member] \| Chief Executive Officer [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	90,000
Equity Incentive Plan 2023 [Member] \| Chief Executive Officer [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	360,000
Equity Incentive Plan 2023 [Member] \| Chief Executive Officer [Member] \| Vesting Each Year [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	120,000
Equity Incentive Plan 2023 [Member] \| Employees and Consultants 2 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	100,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.42
Equity Incentive Plan 2023 [Member] \| Employees and Consultants 2 [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	4 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] \| Share-Based Payment Arrangement, Option [Member] \| Non-employee Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)			3 years
Equity Incentive Plan 2023 [Member] \| Incentive Options [Member] \| Employees and Consultants [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	130,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.42
Equity Incentive Plan 2023 [Member] \| Non-Qualified Options [Member] \| Employees and Consultants [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	25,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.42