Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 9,872,330	$ 37,313,558
Marketable securities	22,680,303	0
Prepaid expenses, deposits and other current assets	1,021,496	510,015
Total current assets	33,574,129	37,823,573
Other assets	0	15,578
Total assets	33,574,129	37,839,151
Current liabilities:
Accounts payable	813,197	947,495
Accrued expenses and other current liabilities	2,142,633	1,980,189
Total current liabilities	2,955,830	2,927,684
Commitments and Contingencies (Note 9)
Stockholders’ Equity:
Common stock, $0.001 par value: 1,000,000,000 shares authorized; 2,038,392 and 2,038,185 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	2,038	2,038
Additional paid-in capital	165,192,671	164,914,540
Accumulated other comprehensive loss	(49,658)	0
Accumulated deficit	(134,531,752)	(130,005,111)
Total stockholders' equity	30,618,299	34,911,467
Total liabilities and stockholders' equity	33,574,129	37,839,151
Series C Preferred Stock [Member]
Stockholders’ Equity:
Series C convertible preferred stock, $0.001 par value: 10,000 shares authorized; 10,000 and 0 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	$ 5,000	$ 0