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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, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Sales $ 66,002 $ 60,717 $ 67,386 $ 79,312 $ 71,679 $ 65,896 $ 75,436 $ 96,204 $ 273,417 $ 309,215 $ 284,125
Gross Profit 19,397 17,725 19,174 21,780 20,522 19,623 23,018 26,785 78,076 89,948 81,246
Income from operations 7,057 5,147 8,087 5,419 8,387 9,293 10,471 9,436 25,710 37,587 30,977
Net income $ 6,066 $ 4,257 $ 6,349 $ 4,428 $ 6,812 $ 7,611 $ 8,412 $ 7,768 $ 21,100 $ 30,603 $ 25,851
Diluted net income per common share (in dollars per share) $ 0.30 $ 0.21 $ 0.31 $ 0.22 $ 0.34 $ 0.38 $ 0.42 $ 0.39 $ 1.04 $ 1.52 $ 1.29