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Major Customers (Tables)
 12 Months Ended
Dec. 31, 2020
Major Customers  
Sales revenue for the above-mentioned customers
2020
2019
2018
Navistar product sales
$
33,656,000
$
54,798,000
$
52,347,000
Navistar tooling sales
6,569,000
2,084,000
2,806,000
Total Navistar sales
40,225,000
56,882,000
55,153,000
UFP product sales
38,530,000
25,395,000
27,906,000
UFP tooling sales
—
—
240,000
Total UFP sales
38,530,000
25,395,000
28,146,000
PACCAR product
 
sales
27,997,000
44,543,000
38,027,000
PACCAR tooling
 
sales
507,000
1,525,000
6,425,000
Total PACCAR
 
sales
28,504,000
46,068,000
44,452,000
Volvo
 
product sales
23,538,000
48,487,000
46,063,000
Volvo
 
tooling sales
2,186,000
262,000
97,000
Total Volvo
 
sales
25,724,000
48,749,000
46,160,000
BRP product sales
20,269,000
16,774,000
13,629,000
BRP tooling sales
1,662,000
4,208,000
2,169,000
Total BRP sales
21,931,000
20,982,000
15,798,000
Other product sales
66,590,000
78,990,000
78,245,000
Other tooling sales
852,000
7,224,000
1,531,000
Total other sales
67,442,000
86,214,000
79,776,000
Total product sales
210,580,000
268,987,000
256,217,000
Total tooling sales
11,776,000
15,303,000
13,268,000
Total sales
$
222,356,000
$
284,290,000
$
269,485,000