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Note 11 - Related Party Transactions
 3 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Related Party Transactions Disclosure [Text Block]
11
. Related Party Transactions
 
As a result of the Company’s acquisition of IXYS, the Company has equity ownerships in various investments that are accounted for under the equity method. The following is a description of the investments and related party transactions.
 
Powersem
GmbH
:
The Company owns
45%
of the outstanding equity of Powersem GmbH (“Powersem”), a module manufacturer based in Germany. During the
three
months ended
March 31, 2018,
the Company recorded revenues of
$0.1
 million from sales of products to Powersem for use as components in their products. During the
three
months ended
March 31, 2018,
the Company purchased
$1.1
 million of products from Powersem. At
March 
31,
2018,
the accounts receivable balance from Powersem was
$0.1
million and the accounts payable balance to Powersem was
$0.3
million.
 
EB Tech Ltd.:
The Company owns approximately
20%
of the outstanding equity of EB Tech Ltd. (“EB Tech”), a company with expertise in radiation technology based in South Korea. During the
three
months ended
March 31, 2018
EB Tech rendered processing services for the Company totaling approximately
$0.1
million. As of
March 
31,
2018,
the Company’s accounts payable balance to EB Tech was immaterial.
 
Automated Technology, Inc.
: The Company owns approximately
24%
of the outstanding common shares of Automated Technology, Inc (“ATEC”), a supplier located in the Philippines that provides assembly and test services. During the
three
months ended
March 31, 2018,
ATEC rendered assembly and test services to the Company totaling approximately
$2.4
 million. As of
March 
31,
2018,
the Company’s accounts payable balance to ATEC was
$0.8
million.