Note F - Property, Plant and Equipment (Details Textual) - USD ($)	9 Months Ended
Dec. 31, 2020	Mar. 31, 2020
Construction in Progress, Gross	$ 6,478,594	$ 3,797,364
Equipment [Member]
Capital Expenditures Incurred but Not yet Paid	$ 7,200,000

Future cash outflow to pay for purchases of fixed assets that have occurred.

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