Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 7,386	$ 11,867
Prepaid expenses and other current assets	182	91
Income tax receivable	365	321
Total current assets	7,933	12,279
Deposits held for clinical trial costs	3,155	593
Total assets	11,088	12,872
Current liabilities:
Accounts payable	3,986	640
Accrued expenses	521	2,020
Total current liabilities	4,507	2,660
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 authorized; no shares issued or outstanding as of March 31, 2022 and December 31, 2021	0	0
Common stock, $0.001 par value; 100,000,000 authorized; 13,449,117 and 13,443,722 shares issued and outstanding as of March 31, 2022 and December 31, 2021, respectively	13	13
Additional paid-in capital	66,561	66,227
Accumulated deficit	(59,827)	(56,161)
Accumulated comprehensive (loss) income	(166)	133
Total stockholders' equity	6,581	10,212
Total liabilities and stockholders' equity	$ 11,088	$ 12,872

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).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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).