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Note 6 - Net Income Per Share - Computation of Net Income Per Share - Basic & Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 3,252,000	$ 2,597,000	$ 7,540,000	$ 7,178,000
Weighted average outstanding shares of common stock (in shares)	3,688	3,614	3,668	3,596
Dilutive effect of stock options (in shares)	180	172	167	162
Common stock and equivalents (in shares)	3,868	3,786	3,835	3,758
Basic (in dollars per share)	$ 0.88	$ 0.72	$ 2.06	$ 2
Diluted (in dollars per share)	$ 0.84	$ 0.69	$ 1.97	$ 1.91

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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