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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Numerator:      
Net loss from continuing operations $ (10,638) $ (8,786) $ (18,437)
Net income (loss) from discontinued operations 0 0 6,559
Net loss $ (10,638) $ (8,786) $ (11,878)
Denominator (in thousands):      
Basic and diluted (in shares) 24,295 23,613 23,484
Effect of stock-based awards (in shares) 0 0 0
Diluted weighted-average common stock outstanding (in shares) 24,295 23,613 23,484
From continuing operations (in dollars per share) $ (0.44) $ (0.37) $ (0.79)
Basic net income (loss) per share from discontinued operations (in dollars per share) 0 0 0.28
From continuing operations (in dollars per share) (0.44) (0.37) (0.51)
Diluted net loss per share from continuing operations (in dollars per share) (0.44) (0.37) (0.79)
Diluted net income (loss) per share from discontinued operations (in dollars per share) 0 0 0.28
Diluted net loss per share (in dollars per share) $ (0.44) $ (0.37) $ (0.51)