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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, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income available for shareholders	$ 3,062	$ 4,597	$ 994	$ 4,230	$ 7,659	$ 5,224
Weighted average outstanding shares of common stock (in shares)	4,155		3,850		4,029	3,833
Dilutive effect of stock options (in shares)	156		188		166	183
Dilutive effect of non-vested shares (in shares)	10		8		10	13
Fully diluted shares (in shares)	4,321		4,046		4,205	4,029
Basic (in dollars per share)	$ 0.74		$ 0.26		$ 1.90	$ 1.36
Diluted (in dollars per share)	$ 0.71		$ 0.25		$ 1.82	$ 1.30

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