Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 17,058,527	$ 10,380,493
Restricted cash	110,000	110,000
Prepaid expenses	813,168	509,833
Research and development tax rebate receivable	406,306	518,098
Other current assets	140	30,942
Total current assets	18,388,141	11,549,366
Furniture and equipment, net	44,174	54,487
Intangible assets, net	83,958	99,375
Right-of-use asset	75,822
Other assets	17,218	17,218
Total Assets	18,609,313	11,720,446
Current liabilities
Accounts payable	318,266	353,328
Accrued expenses	53,485	177,074
Payroll liabilities	589,445	935,070
Stock-based compensation liability		1,410,025
Lease liability	51,795
Other current liabilities	19,838	39,939
Total current liabilities	1,032,829	2,915,436
Long term liabilities
Lease liability long term	24,027
Total Liabilities	1,056,856	2,915,436
Commitments and contingencies (note 11)
Stockholders' equity
Preferred stock - $0.001 par value; 10,000,000 shares authorized; 676 and 2,379 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	1	2
Additional paid-in capital- Series B convertible preferred stock	675,999	2,378,997
Common stock - $0.18 par value; 175,000,000 shares authorized, and 9,129,563 and 5,846,552 shares issued and outstanding, as of June 30, 2019 and December 31, 2018, respectively	1,643,309	1,052,372
Additional paid-in capital	103,400,247	82,204,902
Accumulated deficit	(88,167,099)	(76,831,263)
Total Stockholders' Equity	17,552,457	8,805,010
Total Liabilities and Stockholders' Equity	$ 18,609,313	$ 11,720,446