Note 3 - Discontinued Operations and Sale of a Business (Details Textual) - Power and Electromechanical Business [Member] - Discontinued Operations, Disposed of by Sale [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Provided by (Used in) Operating Activities, Discontinued Operations	$ (1,900)	$ 2,900
Cash Provided by (Used in) Investing Activities, Discontinued Operations	$ 0	$ 300