Note B - Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Mar. 31, 2019
Building and Building Improvements [Member] | Minimum [Member]
Building and improvements (years) (Year)	5 years
Building and Building Improvements [Member] | Maximum [Member]
Building and improvements (years) (Year)	25 years
Machinery, Equipment, Furniture, and Fixtures [Member] | Minimum [Member]
Building and improvements (years) (Year)	3 years
Machinery, Equipment, Furniture, and Fixtures [Member] | Maximum [Member]
Building and improvements (years) (Year)	15 years
Leasehold Improvements [Member] | Minimum [Member]
Building and improvements (years) (Year)	5 years
Leasehold Improvements [Member] | Maximum [Member]
Building and improvements (years) (Year)	20 years