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Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Revenues | $ 13,770 | $ 12,607
Operating profit (loss) | (6,236) | (5,128)
Corporate, Non-Segment [Member] |  |
Operating profit (loss) | (249) | (1,095)
Grid [Member] |  |
Revenues | 9,855 | 8,929
Grid [Member] | Operating Segments [Member] |  |
Operating profit (loss) | (4,663) | (2,666)
Wind [Member] |  |
Revenues | 3,915 | 3,678
Wind [Member] | Operating Segments [Member] |  |
Operating profit (loss) | $ (1,324) | $ (1,367)

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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