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Note 9 - 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, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018		Mar. 31, 2017
Net income (loss) available for shareholders	$ 1,402	$ 858	$ 994	$ 4,230	$ 4,254	$ (11,086)	$ 2,353	$ 1,517	$ 7,484	$ (2,962)	[1]	$ 11,183	[1]
Weighted average outstanding shares of common stock (in shares)									3,839	3,770		3,679
Dilutive effect of stock options (in shares)									186			165
Dilutive effect of non-vested shares (in shares)									8
Fully diluted shares (in shares)									4,033	3,770		3,844
Basic (in dollars per share)	$ 0.36	$ 0.22	$ 0.26	$ 1.11	$ 1.12	$ (2.93)	$ 0.63	$ 0.41	$ 1.95	$ (0.79)		$ 3.04
Diluted (in dollars per share)	$ 0.34	$ 0.21	$ 0.25	$ 1.06	$ 1.08	$ (2.93)	$ 0.60	$ 0.39	$ 1.86	$ (0.79)		$ 2.91
[1] Contingent consideration has been reclassified to align with current year presentation.

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