Annual report pursuant to Section 13 and 15(d)

Industry, Segment and Geographic Financial Information - Sales and Assets (Details)

v3.19.1
Industry, Segment and Geographic Financial Information - Sales and Assets (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
country
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
country
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
country
Dec. 31, 2017
USD ($)
country
Dec. 31, 2016
USD ($)
country
Net sales to unaffiliated customers and identifiable assets by geographic areas                      
Number of countries other than USA that make up 10% or more of net sales | country 0       0       0 0 0
Net sales to Unaffiliated Customers $ 49,055 $ 47,923 $ 43,914 $ 40,552 $ 44,437 $ 39,018 $ 39,021 $ 38,091 $ 181,444 $ 160,567 $ 164,609
Identifiable Assets by Geographic Areas 107,971       104,690       107,971 104,690 116,252
USA                      
Net sales to unaffiliated customers and identifiable assets by geographic areas                      
Net sales to Unaffiliated Customers                 159,275 137,185 141,571
USA and Rest of the world                      
Net sales to unaffiliated customers and identifiable assets by geographic areas                      
Identifiable Assets by Geographic Areas 100,681       97,481       100,681 97,481 108,568
Canada                      
Net sales to unaffiliated customers and identifiable assets by geographic areas                      
Net sales to Unaffiliated Customers                 12,036 11,835 12,694
Identifiable Assets by Geographic Areas $ 7,290       $ 7,209       7,290 7,209 7,684
Rest of the world                      
Net sales to unaffiliated customers and identifiable assets by geographic areas                      
Net sales to Unaffiliated Customers                 $ 10,133 $ 11,547 $ 10,344