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Note 8 - Earnings Per Share - Computation of Net Income Per Share, Basic & Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income available for shareholders	$ 994	$ 2,353	$ 5,224	$ 3,870
Basic (in shares)	3,850	3,764	3,833	3,754
Dilutive effect of stock options (in shares)	188	171	183	180
Dilutive effect of non-vested shares (in shares)	8		13
Diluted (in shares)	4,046	3,935	4,029	3,934
Basic (in dollars per share)	$ 0.26	$ 0.63	$ 1.36	$ 1.03
Diluted (in dollars per share)	$ 0.25	$ 0.60	$ 1.30	$ 0.98

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