Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 822,597	$ 454,030
Grant funds receivable	78,772	28,074
Prepaid expenses and other current assets	32,248	62,275
Total current assets	933,617	544,379
Property and equipment, net	45,382	54,828
Deposits	11,010	11,010
Total assets	990,009	610,217
Current liabilities:
Accounts payable	151,954	75,607
Accrued expenses (Note 6)	499,638	294,240
Total current liabilities	651,592	369,847
Commitments (Note 7)
Stockholders’ equity:
Common stock, $.001 par value: Authorized shares - 300,000,000 Issued and outstanding shares – 62,913,900 and 55,235,233 at June 30, 2017 and December 31, 2016, respectively	62,914	55,235
Additional paid-in capital	35,109,553	34,914,963
Accumulated deficit	(36,811,850)	(35,746,628)
Total stockholders’ equity	338,417	240,370
Total liabilities and stockholders’ equity	990,009	610,217
Series B Convertible Preferred Stock [Member]
Stockholders’ equity:
Convertible Preferred Stock	76,095	76,095
Series C Convertible Preferred Stock [Member]
Stockholders’ equity:
Convertible Preferred Stock	921,705	940,705
Series D Convertible Preferred Stock [Member]
Stockholders’ equity:
Convertible Preferred Stock	$ 980,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).