Note F - Investment in and Transactions with Equity Investees - Summarized Financial Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current assets	$ 18,554,869	$ 6,077,171
Total assets:	19,571,450	6,556,289
Current liabilities	2,877,894	4,927,642
Stockholders' deficit	16,106,968	1,628,647	$ 1,528,208
Total liabilities and stockholders’ deficit	19,571,450	6,556,289
Gross profit	3,621,312	5,718,359
Net loss	(7,388,812)	(7,580,240)
Milestone China [Member]
Current assets		8,392,858
Non-current assets		5,082,313
Total assets:		13,475,171
Current liabilities		17,910,452
Stockholders' deficit		(4,435,281)
Total liabilities and stockholders’ deficit		13,475,171
Net sales		3,401,025
Cost of goods sold		1,724,882
Gross profit		1,676,143
Other expenses		(3,996,663)
Net loss		$ (2,320,520)
Milestone China and Anhui [Member]
Current assets	4,726,883
Non-current assets	4,040,327
Total assets:	8,767,210
Current liabilities	10,885,019
Stockholders' deficit	(2,117,809)
Total liabilities and stockholders’ deficit	8,767,210
Net sales	4,183,774
Cost of goods sold	2,895,092
Gross profit	1,288,682
Other expenses	(5,376,391)
Net loss	$ (4,087,709)