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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenues | $ 14,012 | $ 14,876 | $ 27,782 | $ 27,483
Grid [Member] |  |  |  |
Revenues | 11,489 | 7,569 | 21,345 | 16,498
Grid [Member] | Americas [Member] |  |  |  |
Revenues | 10,698 | 5,052 | 18,499 | 12,548
Grid [Member] | Asia Pacific [Member] |  |  |  |
Revenues | 393 | 2,308 | 2,220 | 3,115
Grid [Member] | EMEA [Member] |  |  |  |
Revenues | 398 | 209 | 626 | 835
Wind [Member] |  |  |  |
Revenues | 2,523 | 7,307 | 6,437 | 10,985
Wind [Member] | Americas [Member] |  |  |  |
Revenues | 1 | 24 | 47 | 47
Wind [Member] | Asia Pacific [Member] |  |  |  |
Revenues | 2,464 | 7,278 | 6,320 | 10,873
Wind [Member] | EMEA [Member] |  |  |  |
Revenues | 58 | 5 | 70 | 65
Equipment and Systems [Member] | Grid [Member] |  |  |  |
Revenues | 10,044 | 5,503 | 18,399 | 12,957
Equipment and Systems [Member] | Wind [Member] |  |  |  |
Revenues | 2,077 | 7,219 | 5,581 | 10,711
Services and Technology Development [Member] | Grid [Member] |  |  |  |
Revenues | 1,445 | 2,066 | 2,946 | 3,541
Services and Technology Development [Member] | Wind [Member] |  |  |  |
Revenues | $ 446 | $ 88 | $ 856 | $ 274

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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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