Sales Revenue, Net [Member] | Power and Electromechanical Segment [Member]

Sales Revenue, Net [Member] | Energy Segment [Member]

Customer Concentration Risk [Member] | Sales Revenue, Net [Member]

Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Power and Electromechanical Segment [Member] | Digi Key Electronics [Member]

Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Power and Electromechanical Segment [Member] | Future Electronics [Member]

Customer Concentration Risk [Member] | Accounts Receivable [Member]

Customer Concentration Risk [Member] | Accounts Receivable [Member] | Power and Electromechanical Segment [Member] | Digi Key Electronics [Member]

Customer Concentration Risk [Member] | Accounts Receivable [Member] | Power and Electromechanical Segment [Member] | GL Industrial Services UK Ltd. [Member]

Customer Concentration Risk [Member] | Accounts Receivable [Member] | Energy Segment [Member] | Digi Key Electronics [Member]

Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]

Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED KINGDOM

Geographic Concentration Risk [Member] | Accounts Receivable [Member]

Geographic Concentration Risk [Member] | Accounts Receivable [Member] | UNITED KINGDOM

Geographic Concentration Risk [Member] | Accounts Receivable [Member] | CANADA

Note 19 - Concentrations - Concentration Risk (Details)	3 Months Ended		6 Months Ended		12 Months Ended
Note 19 - Concentrations - Concentration Risk (Details)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
UNITED KINGDOM
Concentration risk, percentage	9.00%	17.00%	12.00%	17.00%
Sales Revenue, Net [Member] \| Power and Electromechanical Segment [Member]
Concentration risk, percentage	88.00%	81.00%	83.00%	79.00%
Sales Revenue, Net [Member] \| Energy Segment [Member]
Concentration risk, percentage	12.00%	19.00%	17.00%	21.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Concentration risk, percentage	40.00%	38.00%	39.00%	26.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Power and Electromechanical Segment [Member] \| Digi Key Electronics [Member]
Concentration risk, percentage	26.00%	28.00%	26.00%	26.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Power and Electromechanical Segment [Member] \| Future Electronics [Member]
Concentration risk, percentage	14.00%	10.00%	13.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration risk, percentage			18.00%		21.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Power and Electromechanical Segment [Member] \| Digi Key Electronics [Member]
Concentration risk, percentage			18.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Power and Electromechanical Segment [Member] \| GL Industrial Services UK Ltd. [Member]
Concentration risk, percentage					11.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Energy Segment [Member] \| Digi Key Electronics [Member]
Concentration risk, percentage					10.00%
Geographic Concentration Risk [Member] \| Sales Revenue, Net [Member]
Concentration risk, percentage		17.00%	12.00%	17.00%
Geographic Concentration Risk [Member] \| Sales Revenue, Net [Member] \| UNITED KINGDOM
Concentration risk, percentage		17.00%	12.00%	17.00%
Geographic Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration risk, percentage			16.00%		39.00%
Geographic Concentration Risk [Member] \| Accounts Receivable [Member] \| UNITED KINGDOM
Concentration risk, percentage			16.00%		28.00%
Geographic Concentration Risk [Member] \| Accounts Receivable [Member] \| CANADA
Concentration risk, percentage					11.00%