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Note 4 - Inventories - Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Raw materials and in-process $ 22,039 $ 17,528
Finished parts 50,525 48,247
Finished products 9,480 9,192
Total net inventories $ 82,044 $ 74,967