Note F - Property, Plant and Equipment (Details Textual)	3 Months Ended
	Dec. 31, 2019 USD ($) ft²	Mar. 31, 2019 USD ($)
Number of Capital Expenditure Projects	2
Construction in Progress, Gross	$ 2,114,123
Building [Member]
Area of Real Estate Property | ft²	22,000
Capital Expenditures Incurred but Not yet Paid	$ 1,100,000
Equipment [Member]
Capital Expenditures Incurred but Not yet Paid	$ 5,800,000