Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 7,462,736	$ 12,581,136
Restricted cash	110,000	110,000
Prepaid expenses	1,464,366	862,344
Research and development tax rebate receivable	760,622	739,656
Other current assets	263,957	26,130
Total current assets	10,061,681	14,319,266
Furniture and equipment, net	29,440	34,350
Intangible assets, net	53,125	68,542
Right-of-use asset	44,235	50,479
Other assets	17,218	17,218
Total Assets	10,205,699	14,489,855
Current liabilities
Accounts payable	1,032,707	293,171
Accrued expenses	92,855	77,888
Payroll liabilities	655,408	899,420
Lease liability	39,515	39,371
Other current liabilities	6,188	12,892
Total current liabilities	1,826,673	1,322,742
Long term liabilities
Lease liability long term	4,720	11,108
Total Liabilities	1,831,393	1,333,850
Commitments and contingencies (Note 12)
Stockholders' equity
Preferred stock - $0.001 par value; 10,000,000 shares authorized; 626 and 671 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	1	1
Additional paid-in capital - Series B convertible preferred stock	625,999	670,999
Common stock - $0.18 par value; 175,000,000 shares authorized; 9,303,878 and 9,130,984 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	1,674,686	1,643,565
Additional paid-in capital	106,998,222	104,912,480
Accumulated deficit	(100,924,602)	(94,071,040)
Total Stockholders' Equity	8,374,306	13,156,005
Total Liabilities and Stockholders' Equity	$ 10,205,699	$ 14,489,855