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Note 4 - Basic and Diluted Net Income (Loss) Per Share - Basic and Diluted Weighted Average Common Shares Outstanding (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Weighted average common shares outstanding, basic (in shares) 5,537 5,517
Dilutive common equivalent shares (in shares) 107
Weighted average common shares outstanding, diluted (in shares) 5,644 5,517