Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended March 31,
	2024		2023
Beginning balance	$	—	$	50
Add: Accruals for warranties issued during the period		—		—
Less: Adjustment for inventory at cost and excessive and obsolete inventory		—		—
Ending balance	$	—	$	50

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended March 31,
	2024		2023
Common stock warrants		—		7,208,193
Common stock options		10,096,411		5,608,210
Total		10,096,411		12,816,403