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Note 15 - Quarterly Results (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ 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
Revenue	$ 26,446	$ 26,682	$ 24,865	$ 25,142	$ 26,881	$ 23,671	$ 22,954	$ 22,673
Gross profit	15,614	15,634	14,577	15,091	16,034	12,681	13,233	12,671	$ 60,916	$ 54,619		$ 53,239
Net income	$ 1,402	$ 858	$ 994	$ 4,230	$ 4,254	$ (11,086)	$ 2,353	$ 1,517	$ 7,484	$ (2,962)	[1]	$ 11,183	[1]
Basic earnings per share (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 earnings per share (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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