Note 10 - Stock Plans - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Stock-based compensation expense	$ 1,451	$ 1,648
The 2012 Director Stock Incentive Plan [Member]
Stock-based compensation expense	259	484
The 2012 Omnibus Stock Incentive Plan [Member]
Stock-based compensation expense	263	479
The 2022 Omnibus Stock Incentive Plan [Member]
Stock-based compensation expense	803	651
The 2002 Employee Stock Purchase Plan [Member]
Stock-based compensation expense	$ 126	$ 34