Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Number of Operating Segments	3
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 0	$ 0
Accounts Receivable, Allowance for Credit Loss, Writeoff		7,320
Write Off of Patent Costs	0	16,000
Impairment of Long-Lived Assets Held-for-use	0
Research and Development Expense, Total	$ 52,510	32,591
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares	3,099,867
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 409,039	$ 1,276,654	$ 2,038,150
TAIWAN, PROVINCE OF CHINA
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 69,634
Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Minimum [Member] | Patents [Member]
Finite-Lived Intangible Asset, Useful Life	15 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years
Maximum [Member] | Patents [Member]
Finite-Lived Intangible Asset, Useful Life	20 years