Note 9 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Stock-based compensation (c)	[1]	$ 9	$ 9
Restricted Stock [Member]
Stock-based compensation (c)		$ 9	$ 9

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