Note A - Nature of Business and Summary of Significant Accounting Policies - Property, Plant, and Equipment Useful Lives (Details)	12 Months Ended
	Dec. 31, 2019
Property, plant, and equipment, estimated useful lives	Lesser of useful life or 20 years
Factory Equipment And Fixtures [Member] | Minimum [Member]
Property, plant, and equipment, useful lives (Year)	5 years
Factory Equipment And Fixtures [Member] | Maximum [Member]
Property, plant, and equipment, useful lives (Year)	7 years
Building [Member]
Property, plant, and equipment, useful lives (Year)	40 years