Note 7 - Loan Payable (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Debt [Table Text Block]

	December 31,			December 31,
(in thousands)	2023			2022
Loan payable	$	95,000		$	70,000
Add: Accreted Liability of final payment fee		10,230			6,667
		105,230			76,667
Less: unamortized debt issuance costs		(5,112	)		(5,532	)
		100,118			71,135
Less: principal payments		—			—
Total loan payable		100,118			71,135
Less: current portion		—			—
Loan payable non-current	$	100,118		$	71,135

Warrant [Member]

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	The First Amendment			The Amended Loan Agreement			The Loan Agreement
Exercise price	$	14.70		$	17.95		$	4.08
Common share price on date of issuance	$	15.04		$	19.35		$	6.80
Volatility		0.88	%		184.40	%		195.90	%
Risk-free interest rate		3.6	%		1.4	%		2.6	%
Expected dividend yield		—	%		—	%		—	%
Contractual term (in years)		7.00			7.00			7.00