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Note 2 - Acquisitions - Purchase Price (Details) (Parentheticals) - shares	May 06, 2021	Mar. 31, 2021	Oct. 01, 2020
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

X

- 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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- Details

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- Details

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- Details

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