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		12 Months Ended
Note 19 - Concentrations - Concentration Risk (Details)	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Concentration risk, percentage	100.00%	100.00%
UNITED KINGDOM
Concentration risk, percentage	15.00%	17.00%
Sales Revenue, Net [Member] \| Power and Electromechanical Segment [Member]
Concentration risk, percentage	77.00%	77.00%
Sales Revenue, Net [Member] \| Energy Segment [Member]
Concentration risk, percentage		23.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Concentration risk, percentage	37.00%	24.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Power and Electromechanical Segment [Member] \| Digi Key Electronics [Member]
Concentration risk, percentage	25.00%	24.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Power and Electromechanical Segment [Member] \| Future Electronics [Member]
Concentration risk, percentage	12.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration risk, percentage	14.00%		21.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Power and Electromechanical Segment [Member] \| Digi Key Electronics [Member]
Concentration risk, percentage	14.00%
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	15.00%	17.00%
Geographic Concentration Risk [Member] \| Sales Revenue, Net [Member] \| UNITED KINGDOM
Concentration risk, percentage	15.00%	17.00%
Geographic Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration risk, percentage			39.00%
Geographic Concentration Risk [Member] \| Accounts Receivable [Member] \| UNITED KINGDOM
Concentration risk, percentage	24.00%		28.00%
Geographic Concentration Risk [Member] \| Accounts Receivable [Member] \| CANADA
Concentration risk, percentage			11.00%