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Note 4 - Net Income Per Share - Components of Common Shares Outstanding (Details) - shares
3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Weighted average common shares outstanding – basic (in shares) 4,830,826 4,833,232
Dilutive effect of stock options (in shares) 45 3,589
Shares used in computing net income per share – diluted (in shares) 4,830,871 4,836,821