Note 18 - Business Segments - Total Business Segments Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Total assets	$ 119,330	$ 88,175
Operating Segments [Member] | Grid [Member]
Total assets	31,075	37,012
Operating Segments [Member] | Wind [Member]
Total assets	8,167	16,790
Corporate, Non-Segment [Member]
Total assets	$ 80,088	$ 34,373