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Note 21 - Quarterly Financial Information (Unaudited) - Summarized Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net sales $ 144,070 $ 145,165 $ 110,177 $ 105,009 $ 101,498 $ 100,784 $ 100,037 $ 97,753 $ 91,237 $ 96,970 $ 94,343 $ 71,242 $ 504,421 $ 400,072 $ 353,792
Gross profit 42,056 41,523 33,031 30,083 26,129 27,750 29,645 28,701 23,279 25,523 24,324 17,134 $ 146,693 $ 112,225 $ 90,260
Net income $ 16,375 $ 16,361 $ 13,552 $ 12,693 $ 11,607 $ 11,694 $ 11,883 $ 9,739 $ 8,462 $ 19,540 $ 8,929 $ 4,858      
Basic net income per share (in dollars per share) $ 2.13 $ 2.13 $ 1.77 $ 1.66 $ 1.52 $ 1.53 $ 1.56 $ 1.28 $ 1.12 $ 2.58 $ 1.18 $ 0.64 $ 7.69 $ 5.89 $ 5.52
Diluted net income per share (in dollars per share) $ 2.1 $ 2.11 $ 1.75 $ 1.64 $ 1.51 $ 1.52 $ 1.55 $ 1.27 $ 1.1 $ 2.56 $ 1.17 $ 0.64 $ 7.58 $ 5.83 $ 5.45