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Note 2 - Acquisitions - Purchase Price (Details) (Parentheticals) - shares | May 06, 2021 | Mar. 31, 2021 | Oct. 01, 2020
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Neeltran Inc. [Member] | Neeltran Inc. Sellling Stockholders [Member] |  |  |
Issuance of common stock, shares (in shares) | 301,556 |  |
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |
Issuance of common stock, shares (in shares) |  | 873,657 | 873,657

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 + Details
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