Note 19 - Concentrations

3 Months Ended

Mar. 31, 2018

Concentration Risk Disclosure [Text Block]

19.

CONCENTRATIONS

The Company's major product lines are natural gas infrastructure and high-tech solutions in the Energy segment and power and electromechanical products in the Power and Electromechanical segment. The Company had the following revenue concentrations by customer greater than

10%

of consolidated revenue:

For the Three months ended March 31, 2018:
Customer	Segment	Percent
Digi-Key Electronics	Power and Electromechanical		25	%
Future Electronics	Power and Electromechanical		12	%
Total concentrations			37	%

For the Three months ended March 31, 2017:
Customer	Segment	Percent
Digi-Key Electronics	Power and Electromechanical		24	%
Total concentrations			24	%

The Company had the following geographic revenue concentrations outside the U.S.A greater than

10%

of consolidated revenue:

For the Three months ended March 31, 2018:
Country	Percent
United Kingdom		15	%
Total concentrations		15	%

For the Three months ended March 31, 2017:
Country	Percent
United Kingdom		17	%
Total concentrations		17	%

The Company had the following gross trade accounts receivable concentrations by customer greater than

10%

of gross trade accounts receivable:

As of March 31, 2018
Customer	Segment	Percent
Digi-Key Electronics	Power and Electromechanical		14	%
Total concentrations			14	%

As of December 31, 2017
Customer	Segment	Percent
GL Industrial Services UK Ltd.	Power and Electromechanical		11	%
Digi-Key Electronics	Energy		10	%
Total concentrations			21	%

The Company had the following geographic concentrations of gross trade accounts receivable outside of the U.S.A greater than

10%

of gross trade accounts receivable:

As of March 31, 2018:
Country	Percent
United Kingdom		24	%

As of December 31, 2017:
Country	Percent
United Kingdom		28	%
Canada		11	%
Total concentrations		39	%

There were

supplier concentrations greater than

10%

during the

three

months ended

March 31, 2018

and

March 31, 2017.