Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 7,143,821	$ 8,772,567
Contracts and grants receivable	993,490	1,206,777
Prepaid expenses	137,487	134,431
Total current assets	8,274,798	10,113,775
Office furniture and equipment, net	23,122	26,702
Intangible assets, net	111,290	126,628
Total assets	8,409,210	10,267,105
Current liabilities:
Accounts payable	1,346,610	1,708,091
Accrued expenses	1,073,348	806,118
Accrued compensation	172,889	355,648
Total current liabilities	2,592,847	2,869,857
Commitments and contingencies
Shareholders' equity:
Preferred stock, 350,000 shares authorized; none issued or outstanding
Common stock, $.001 par value; 10,000,000 shares authorized at March 31, 2017 and December 31, 2016; respectively; 5,472,532 shares and 5,470,032 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	5,473	5,470
Additional paid-in capital	157,667,289	157,514,740
Accumulated deficit	(151,856,399)	(150,122,962)
Total shareholders' equity	5,816,363	7,397,248
Total liabilities and shareholders' equity	$ 8,409,210	$ 10,267,105