Note 7 - Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Total stock-based compensation expense	$ 1,667	$ 2,317
Selling and Marketing Expense [Member]
Total stock-based compensation expense	299	671
Research and Development Expense [Member]
Total stock-based compensation expense	0	434
General and Administrative Expense [Member]
Total stock-based compensation expense	$ 1,368	$ 1,212