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Note 8 - Stock Based Awards (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 01, 2021	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			3,207,654
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)			0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)			$ 1.45	$ 1.76
Inducement Stock Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		440,000
Inducement Stock Option [Member] \| Vesting on the First Anniversary of the Date of Hire [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%
Inducement Stock Option [Member] \| Vesting in Equal Monthly Installments Over the Next 36 Months [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		75.00%
Share-Based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			4 years
Share-based Payment Arrangement, Expense, Tax Benefit			$ 0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 5,300	$ 5,300
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 6 months
The 2019 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)		662,785	662,785
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum	4.50%