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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, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Revenue	$ 37,964	$ 34,172	$ 31,860	$ 29,941	$ 34,208	$ 31,655	$ 25,536	$ 26,288
Gross profit	24,736	20,653	21,285	20,340	18,769	14,803	15,586	16,204	$ 87,014	$ 65,362	$ 60,916
Net income (loss)	$ 3,920	$ (4,542)	$ 2,679	$ 1,217	$ (1,552)	$ (4,504)	$ 3,172	$ 4,662	$ 3,274	$ 1,778	$ 7,484
Basic earnings (loss) per share (in dollars per share)	$ 0.76	$ (0.89)	$ 0.52	$ 0.27	$ (0.37)	$ (1.03)	$ 0.76	$ 1.20	$ 0.66	$ 0.42	$ 1.95
Earnings Per Share, Diluted, Total (in dollars per share)	$ 0.74	$ (0.89)	$ 0.51	$ 0.26	$ (0.37)	$ (1.03)	$ 0.73	$ 1.14	$ 0.64	$ 0.41	$ 1.86

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