Note 2 - Summary of Significant Accounting Policies (Details Textual) - Accounting Standards Update 2014-09 [Member] $ in Millions	Jan. 01, 2018 USD ($)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 1.9
Power and Electromechanical Segment [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	2.8
Energy Segment [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (0.9)