Note D - Inventories (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Milestone China [Member]
Contract with Customer, Asset, Allowance for Credit Loss, Recovery	$ 151,000
Slow Moving Medical Finished Goods [Member]
Inventory Valuation Reserves, Ending Balance		$ 450,000	$ 450,000
Slow Moving Dental Finished Goods [Member]
Inventory Valuation Reserves, Ending Balance		3,000	$ 318,000
Inventory Write-down		$ 315,000