Note 12 - Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Stock-based compensation expense	$ 452	$ 638	$ 1,499	$ 2,163
Cost of Sales [Member]
Stock-based compensation expense	7	28	20	213
Research and Development Expense [Member]
Stock-based compensation expense	30	6	99	42
General and Administrative Expense [Member]
Stock-based compensation expense	$ 415	$ 604	$ 1,380	$ 1,908