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Note 4 - Acquisition - Unaudited Pro Forma Financial Information (Details) - Honeywell International, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Net sales | $ 125,507 |  | $ 133,104 | $ 383,454 | $ 317,898
Net income | $ 2,517 | [1] | $ 14,153 | $ 22,620 | $ 19,734
Diluted earnings per share (in dollars per share) | $ 0.34 |  | $ 1.93 | $ 3.04 | $ 2.68
[1] | The Acquisition-related costs mentioned above are excluded from the unaudited pro forma net income.

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