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Note 6 - Net Income (Loss) Per-share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 400,000 5,140,000 400,000 5,152,000