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Note 14 - Quarterly Financial Data (Unaudited) - Summarized Unaudited Quarterly Financial Data (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
Sales	$ 74,286	$ 59,915	$ 69,936	$ 79,988	$ 64,565	$ 60,068	$ 71,396	$ 87,390
Gross Profit	21,686	17,697	20,002	21,861	20,724	19,381	25,255	29,954	$ 81,246	$ 95,314	$ 97,807
Income from operations	8,513	7,932	8,371	6,161	7,802	9,413	13,203	15,757	30,977	46,174	52,136
Net income	$ 7,003	$ 6,840	$ 6,665	$ 5,343	$ 6,620	$ 7,787	$ 10,752	$ 12,582	$ 25,851	$ 37,740	$ 37,283
Diluted net income per common share (in dollars per share)	$ 0.35	$ 0.34	$ 0.33	$ 0.26	$ 0.32	$ 0.38	$ 0.52	$ 0.62	$ 1.29	$ 1.84	$ 1.82

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