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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Weighted average common shares outstanding, basic (in shares) 5,539 5,523 5,538 5,520
Dilutive common equivalent shares (in shares) 88 0 83 0
Weighted average common shares outstanding, diluted (in shares) 5,627 5,523 5,621 5,520