Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 8,372,741	$ 7,991,172
Prepaid expenses, deposits and other current assets	1,036,753	923,059
Total current assets	9,409,494	8,914,231
Property and equipment, net	297,619	350,281
Intangible asset	8,639,000	8,639,000
Right of use asset	291,849
Other assets	291,176	298,480
Total assets	18,929,138	18,201,992
Current liabilities:
Accounts payable	489,133	198,818
Accrued expenses and other current liabilities	443,437	605,226
Current operating lease liability	110,473
Total current liabilities	1,043,043	804,044
Deferred income taxes	1,527,133	1,786,389
Noncurrent operating lease liability	181,376
Total liabilities	2,751,552	2,590,433
Commitments and Contingencies (Note 7)
Stockholders’ Equity:
Common stock, $0.001 par value: 1,000,000,000 shares authorized; 4,693,290 and 3,376,230 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	4,694	3,377
Additional paid-in capital	101,340,798	95,532,881
Accumulated deficit	(85,167,906)	(79,924,699)
Total stockholders' equity	16,177,586	15,611,559
Total liabilities and stockholders' equity	$ 18,929,138	$ 18,201,992