Note 7 - Fair Value Measurements (Details Textual) - USD ($)	Mar. 31, 2021	Mar. 31, 2020
Property, Plant and Equipment, Net, Ending Balance	$ 15,461,256	$ 11,500,556
Pipe Finishing Facility [Member] \| Tubular [Member]
Property, Plant and Equipment, Net, Ending Balance	$ 1,771,450	$ 1,771,450

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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