Note 9 - Stock-based Compensation - 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	[1]	$ 18	$ 9	$ 44	$ 27
Restricted Stock [Member]
Stock-based compensation expense		$ 18	$ 9	$ 44	$ 27

[1] Stock-based compensation is included within the Compensation expense caption.