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Note 12 - 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								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Net income (loss) available for shareholders	$ (1,680)	$ (4,630)	$ 3,062	$ 4,597	$ 1,402	$ 858	$ 994	$ 4,230	$ 1,349	$ 7,484	$ (2,962)
Weighted average outstanding shares of common stock (in shares)									4,200	3,839	3,770
Dilutive effect of stock options (in shares)									159	186
Dilutive effect of non-vested shares (in shares)									12	8
Fully diluted shares (in shares)									4,371	4,033	3,770
Basic (in dollars per share)	$ (0.38)	$ (1.06)	$ 0.74	$ 1.18	$ 0.36	$ 0.22	$ 0.26	$ 1.11	$ 0.32	$ 1.95	$ (0.79)
Diluted (in dollars per share)	$ (0.37)	$ (1.06)	$ 0.71	$ 1.13	$ 0.34	$ 0.21	$ 0.25	$ 1.06	$ 0.31	$ 1.86	$ (0.79)

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