Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 10,828,228	$ 14,177,349
Prepaid expenses, deposits and other current assets	888,234	472,464
Total current assets	11,716,462	14,649,813
Property and equipment, net	225,346	252,366
Intangible asset	8,639,000	8,639,000
Right of use asset	223,757	247,043
Other assets	252,561	322,301
Total assets	21,057,126	24,110,523
Current liabilities:
Accounts payable	655,298	1,251,412
Accrued expenses and other current liabilities	519,552	358,532
Current operating lease liability	111,970	111,477
Total current liabilities	1,286,820	1,721,421
Deferred income taxes	1,756,894	2,119,274
Noncurrent operating lease liability	111,787	135,566
Total liabilities	3,155,501	3,976,261
Commitments and Contingencies (Note 7)
Stockholders’ Equity:
Common stock, $0.001 par value: 1,000,000,000 shares authorized; 34,604,436 and 33,480,365 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	34,605	33,481
Additional paid-in capital	112,149,913	111,824,859
Accumulated deficit	(94,282,893)	(91,724,078)
Total stockholders' equity	17,901,625	20,134,262
Total liabilities and stockholders' equity	$ 21,057,126	$ 24,110,523