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Note 7 - Earnings Per Share - Computation of Net Income Per Share, Basic & Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net income available for shareholders	$ 4,597	$ 4,230
Weighted average outstanding shares of common stock (in shares)	3,901	3,816
Dilutive effect of stock options (in shares)	175	177
Dilutive effect of non-vested shares (in shares)	10	13
Fully diluted shares (in shares)	4,086	4,006
Basic (in dollars per share)	$ 1.18	$ 1.11
Diluted (in dollars per share)	$ 1.13	$ 1.06

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