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Note 5 - Accounts Receivable (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss, Noncurrent	$ 1,720,000		$ 1,720,000			$ 1,720,000
Percentage of Remaining Balance Owned Reserved			100.00%
Revenue from Contract with Customer, Including Assessed Tax	943,325	$ 452,714	$ 1,772,952	$ 1,732,720
License [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 346,479	$ 98,272	$ 605,366	$ 241,780
License [Member] | CHINA
Revenue from Contract with Customer, Including Assessed Tax					$ 1,100,000
Receivables, Net, Current, Total						$ 555,555

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Amount of allowance for credit loss on accounts receivable, classified as noncurrent.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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