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Note 4 - Accounts Receivable (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss, Noncurrent	$ 1,720,000		$ 1,720,000
Percentage of Remaining Balance Owned Reserved	100.00%		100.00%
Revenue from Contract with Customer, Including Assessed Tax	$ 522,485	$ 551,623
License [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 235,345	83,208
License [Member] | CHINA
Revenue from Contract with Customer, Including Assessed Tax				$ 1,100,000
Receivables, Net, Current, Total		$ 555,555
Accounts Receivable, Allowance for Credit Loss, Writeoff			$ 555,555

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The percentage of remaining balance owned under the contract that has been reserved.

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

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Amount of direct write-downs of accounts receivable charged against the allowance.

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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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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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