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Note 15 - Quarterly Financial Data (Unaudited) - Summarized Unaudited Quarterly Financial Data (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
Sales	$ 71,679	$ 65,896	$ 75,436	$ 96,204	$ 74,286	$ 59,915	$ 69,936	$ 79,988	$ 309,215	$ 284,125	$ 283,419
Gross Profit	20,522	19,623	23,018	26,785	21,686	17,697	20,002	21,861	89,948	81,246	95,314
Income from operations	8,387	9,293	10,471	9,436	8,513	7,932	8,371	6,161	37,587	30,977	46,174
Net income	$ 6,812	$ 7,611	$ 8,412	$ 7,768	$ 7,003	$ 6,840	$ 6,665	$ 5,343	$ 30,603	$ 25,851	$ 37,740
Diluted net income per common share (in dollars per share)	$ 0.34	$ 0.38	$ 0.42	$ 0.39	$ 0.35	$ 0.34	$ 0.33	$ 0.26	$ 1.52	$ 1.29	$ 1.84

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