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Acquisitions Supplemental Pro Forma Information (Details) - Opengear - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]          
Net sales $ 73,447 $ 79,218   $ 150,660 $ 154,885
Net income $ 2,184 $ 1,770   $ 5,920 $ 4,801
Net income per share - basic $ 0.08 $ 0.06   $ 0.21 $ 0.17
Net income per share - diluted $ 0.07 $ 0.06   $ 0.20 $ 0.17
Acquisition-related costs          
Business Acquisition [Line Items]          
Acquisition costs     $ 2,500