Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 9,351,141	$ 12,581,136
Restricted cash	110,000	110,000
Prepaid expenses	1,337,120	862,344
Research and development tax rebate receivable	734,340	739,656
Other current assets	134,519	26,130
Total current assets	11,667,120	14,319,266
Furniture and equipment, net	29,734	34,350
Intangible assets, net	60,833	68,542
Right-of-use asset	37,397	50,479
Other assets	17,218	17,218
Total Assets	11,812,302	14,489,855
Current liabilities
Accounts payable	356,252	293,171
Accrued expenses	52,474	77,888
Payroll liabilities	466,383	899,420
Lease liability	29,385	39,371
Other current liabilities	3,458	12,892
Total current liabilities	907,952	1,322,742
Long term liabilities
Lease liability long term	8,013	11,108
Total Liabilities	915,965	1,333,850
Commitments and contingencies (Note 12)
Stockholders' equity
Preferred stock - $0.001 par value; 10,000,000 shares authorized; 671 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	1	1
Additional paid-in capital - Series B convertible preferred stock	670,999	670,999
Common stock - $0.18 par value; 175,000,000 shares authorized, and 9,130,984 shares issued and outstanding, as of March 31, 2020 and December 31, 2019, respectively	1,643,565	1,643,565
Additional paid-in capital	105,600,232	104,912,480
Accumulated deficit	(97,018,460)	(94,071,040)
Total Stockholders' Equity	10,896,337	13,156,005
Total Liabilities and Stockholders' Equity	$ 11,812,302	$ 14,489,855