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Note 9 - 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, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income available for shareholders	$ 2,679	$ 1,217	$ 3,172	$ 4,662	$ 3,896	$ 7,834
Weighted average outstanding shares of common stock (in shares)	5,110		4,155		4,821	4,029
Dilutive effect of stock options (in shares)	119		156		125	166
Dilutive effect of non-vested shares (in shares)	12		10		12	10
Fully diluted shares (in shares)	5,241		4,321		4,958	4,205
Basic (in dollars per share)	$ 0.52		$ 0.76		$ 0.81	$ 1.94
Diluted (in dollars per share)	$ 0.51		$ 0.73		$ 0.79	$ 1.86

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