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Note 1 - Organization and Significant Accounting Policies - Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net loss from continuing operations $ (8,786) $ (18,437) $ (13,878)
Net income (loss) from discontinued operations 0 6,559 (9,305)
Net loss $ (8,786) $ (11,878) $ (23,183)
Denominator (in thousands):      
Basic (in shares) 23,613 23,484 23,172
Effect of stock-based awards (in shares) 0 0 0
Diluted weighted-average common stock outstanding (in shares) 23,613 23,484 23,172
Basic net loss per share from continuing operations (in dollars per share) $ (0.37) $ (0.79) $ (0.6)
Basic net income (loss) per share from discontinued operations (in dollars per share) 0 0.28 (0.4)
Basic net loss per share (in dollars per share) (0.37) (0.51) (1)
Diluted net loss per share from continuing operations (in dollars per share) (0.37) (0.79) (0.6)
Diluted net income (loss) per share from discontinued operations (in dollars per share) 0 0.28 (0.4)
Diluted net loss per share (in dollars per share) $ (0.37) $ (0.51) $ (1)