Note 13 - Equity-based Compensation - Summary of Stock-based Compensation Expense Included in Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stock-based compensation expense	$ 62	$ (208)	$ 201	$ 130
Research and Development Expense [Member]
Stock-based compensation expense	5	5	16	14
Selling and Marketing Expense [Member]
Stock-based compensation expense	18	12	49	37
General and Administrative Expense [Member]
Stock-based compensation expense	$ 39	$ (225)	$ 136	$ 79