Note 6 - Stock Subscriptions and Other Receivables and Concentrations of Credit Risk - Accounts and Other Receivables (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Accounts and other receivables	$ 2,987,319	$ 901,339
Stock Subscriptions [Member]
Accounts and other receivables	2,925,000	811,946
License Revenue Receivable [Member]
Accounts and other receivables	58,754
Grant Revenue Receivable [Member]
Accounts and other receivables	1,117	84,366
Other Accounts Receivable [Member]
Accounts and other receivables	$ 2,448	$ 5,027