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Note 2 - Significant Accounting Policies - Basic and Diluted Earnings (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Net loss attributable to common stockholders | $ (1,318) | $ (2,704)
Less: income attributable to participating securities | (162) | (165)
Subtotal | $ (1,480) | $ (2,869)
Weighted-average common shares outstanding (in shares) | 16,063 | 16,063
Basic and diluted net loss per share attributable to common stockholders (in dollars per share) | $ (0.09) | $ (0.18)

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