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Note 17 - Quarterly Results (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ 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
Revenue	$ 34,208	$ 31,655	$ 25,536	$ 26,288	$ 26,446	$ 26,682	$ 24,865	$ 25,142
Gross profit	18,641	14,677	15,476	16,139	15,614	15,634	14,577	15,091	$ 64,933	$ 60,916	$ 54,619
Net income (loss)	$ (1,680)	$ (4,630)	$ 3,062	$ 4,597	$ 1,402	$ 858	$ 994	$ 4,230	$ 1,349	$ 7,484	$ (2,962)
Basic earnings (loss) per share (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 earnings (loss) per share (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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