Note 19 - Concentrations (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

For the three months ended June 30, 2018:
Customer	Segment	Percent
Digi-Key Electronics	Power and Electromechanical		26	%
Future Electronics	Power and Electromechanical		14	%
Total concentrations			40	%

For the three months ended June 30, 2017:
Customer	Segment	Percent
Digi-Key Electronics	Power and Electromechanical		28	%
Future Electronics	Power and Electromechanical		10	%
Total concentrations			38	%

For the six months ended June 30, 2018:
Customer	Segment	Percent
Digi-Key Electronics	Power and Electromechanical		26	%
Future Electronics	Power and Electromechanical		13	%
Total concentrations			39	%

For the six months ended June 30, 2017:
Customer	Segment	Percent
Digi-Key Electronics	Power and Electromechanical		26	%
Total concentrations			26	%

For the three months ended June 30, 2018:
Country	Percent
None		—	%

For the three months ended June 30, 2017:
Country	Percent
United Kingdom		17	%
Total concentrations		17	%

For the six months ended June 30, 2018:
Country	Percent
United Kingdom		12	%
Total concentrations		12	%

For the six months ended June 30, 2017:
Country	Percent
United Kingdom		17	%
Total concentrations		17	%

As of June 30, 2018
Customer	Segment	Percent
Digi-Key Electronics	Power and Electromechanical		18	%
Total concentrations			18	%

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

As of June 30, 2018:
Country	Percent
United Kingdom		16	%
Total concentrations		16	%

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