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Note 2 - Segment Information (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
Note 2 - Segment Information (Details Textual)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Number of Reportable Segments			3
Sales Revenue, Segment [Member] \| Customer Concentration Risk [Member] \| Electric [Member]
Number of Customers					1
Concentration Risk, Percentage					11.70%
Sales Revenue, Segment [Member] \| Customer Concentration Risk [Member] \| Manufacturing [Member] \| Customer that Manufactures and Sells Recreational Vehicles [Member]
Number of Customers					1
Concentration Risk, Percentage					24.30%
Sales Revenue, Segment [Member] \| Customer Concentration Risk [Member] \| Manufacturing [Member] \| Customer that Manufactures and Sells Lawn and Garden Equipment [Member]
Number of Customers					1
Concentration Risk, Percentage					12.00%
Sales Revenue, Segment [Member] \| Customer Concentration Risk [Member] \| Plastics [Member]
Number of Customers					2
Sales Revenue, Segment [Member] \| Customer Concentration Risk [Member] \| Plastics [Member] \| Customer One [Member]
Concentration Risk, Percentage					20.60%
Sales Revenue, Segment [Member] \| Customer Concentration Risk [Member] \| Plastics [Member] \| Customer Two [Member]
Concentration Risk, Percentage					17.80%
Sales Revenue, Net [Member] \| UNITED STATES
Concentration Risk, Percentage	98.20%	98.30%	98.30%	98.30%