Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 140,040,955	$ 39,553,671
Restricted cash	110,000	110,000
Prepaid expenses	1,883,197	1,813,902
Research and development tax rebate receivable	934,672	634,940
Other current assets	18,060	657,662
Total current assets	142,986,884	42,770,175
Furniture and equipment, net	22,138	20,632
Intangible assets, net	0	13,375
Right-of-use asset	1,217	18,053
Other assets	13,408	17,218
Total Assets	143,023,647	42,839,453
Current liabilities
Accounts payable	667,988	1,588,613
Accrued expenses	75,695	93,367
Payroll liabilities	912,670	963,665
Common stock warrant liability	0	13,003,075
Lease liability	1,217	18,053
Other current liabilities	18,251	4,748
Total current liabilities	1,675,821	15,671,521
Total Liabilities	1,675,821	15,671,521
Commitments and contingencies (Note 13)
Stockholders' equity
Preferred stock - $0.001 par value; 10,000,000 shares authorized; 584 and 621 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	1	1
Common stock - $0.18 par value; 175,000,000 shares authorized; 126,623,541 and 47,548,835 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	22,792,225	8,558,778
Additional paid-in capital	242,373,694	129,887,146
Accumulated deficit	(124,402,093)	(111,898,992)
Total Stockholders' Equity	141,347,826	27,167,932
Total Liabilities and Stockholders' Equity	143,023,647	42,839,453
Series B Preferred Stock [Member]
Stockholders' equity
Additional paid-in capital - Series B convertible preferred stock	$ 583,999	$ 620,999