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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)