Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 9,105,950	$ 12,581,136
Restricted cash	110,000	110,000
Prepaid expenses	1,484,251	862,344
Research and development tax rebate receivable	439,205	739,656
Other current assets	178,911	26,130
Total current assets	11,318,317	14,319,266
Furniture and equipment, net	25,429	34,350
Intangible assets, net	45,417	68,542
Right-of-use asset	31,279	50,479
Other assets	17,218	17,218
Total Assets	11,437,660	14,489,855
Current liabilities
Accounts payable	682,612	293,171
Accrued expenses	85,173	77,888
Payroll liabilities	752,847	899,420
Lease liability	30,063	39,371
Other current liabilities	14,671	12,892
Total current liabilities	1,565,366	1,322,742
Long term liabilities
Lease liability long term	1,217	11,108
Total Liabilities	1,566,583	1,333,850
Commitments and contingencies (Note 12)
Stockholders' equity
Preferred stock - $0.001 par value; 10,000,000 shares authorized; 623 and 671 shares issued and outstanding as of September 30, 2020 and December 31, 2019, respectively	1	1
Common stock - $0.18 par value; 175,000,000 shares authorized; 10,464,250 and 9,130,984 shares issued and outstanding as of September 30, 2020 and December 31, 2019, respectively	1,883,553	1,643,565
Additional paid-in capital	111,780,197	104,912,480
Accumulated deficit	(104,415,673)	(94,071,040)
Total Stockholders' Equity	9,871,077	13,156,005
Total Liabilities and Stockholders' Equity	11,437,660	14,489,855
Series B Preferred Stock [Member]
Stockholders' equity
Additional paid-in capital - Series B convertible preferred stock	$ 622,999	$ 670,999