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Note 7 - Net Income Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 111,000 112,000 111,000 120,000