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Note 8 - Earnings (Loss) Per Share - Computation of Net Income Per Share, Basic & Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Net (loss) income available for shareholders	$ (4,630)	$ 3,062	$ 4,597	$ 858	$ 994	$ 4,230	$ 3,029	$ 6,082
Weighted average outstanding shares of common stock (in shares)	4,367			3,855			4,142	3,840
Dilutive effect of stock options (in shares)				180			251	182
Dilutive effect of non-vested shares (in shares)				10			25	15
Fully diluted shares (in shares)	4,367			4,045			4,418	4,037
Basic (in dollars per share)	$ (1.06)			$ 0.22			$ 0.73	$ 1.58
Diluted (in dollars per share)	$ (1.06)			$ 0.21			$ 0.69	$ 1.51

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