Note 6 - Accounts Receivable - Related Party (Details Textual) - USD ($)	12 Months Ended
Mar. 31, 2018	Mar. 31, 2020
Qol [Member]
Due from Related Parties, Total		$ 330,090
Qol [Member] \| Engineering Services [Member]
Related Party Transaction, Amounts of Transaction	$ 330,090
Qol [Member]
Equity Method Investments		$ 75,000
Equity Method Investment, Ownership Percentage		23.20%

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of transactions with related party during the financial reporting period.

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