Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 1,173	$ 1,779
Prepaid expenses and other current assets	421	795
Total current assets	1,594	2,574
Property and equipment, net	94	111
Restricted cash	9	9
Operating lease right-of-use assets	939	1,051
Intangible assets	24,130	24,130
Total assets	26,766	27,875
Current liabilities:
Accounts payable	3,110	1,879
Accrued expenses	1,785	1,706
Operating lease liabilities - current portion	519	508
Loans payable	167	333
Other current liabilities	359	359
Total current liabilities	6,476	5,717
Operating lease liabilities - non-current portion	519	653
Other liabilities	3,800	3,800
Deferred tax liabilities	4,643	4,528
Total liabilities	15,438	14,698
Mezzanine equity:
Series C redeemable preferred stock, $0.001 par value; 18,820 shares authorized; 2,833 and 11,757 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	1,038	3,181
Stockholders’ equity:
Preferred stock, $0.001 par value; 4,975,680 shares authorized; 0 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	0	0
Common stock, $0.001 par value; 120,000,000 shares authorized; 3,555,954 and 256,397 shares issued and 3,555,953 and 256,396 shares outstanding at March 31, 2025 and December 31, 2024, respectively	4	0
Additional paid-in capital	863,995	859,660
Accumulated deficit	(850,655)	(846,610)
Treasury stock (at cost); 1 share	(3,054)	(3,054)
Total stockholders’ equity	10,290	9,996
Total liabilities, mezzanine equity & stockholders’ equity	26,766	27,875
Series C Preferred Stock [Member]
Mezzanine equity:
Series C redeemable preferred stock, $0.001 par value; 18,820 shares authorized; 2,833 and 11,757 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	1,038	3,181
Series B Preferred Stock [Member]
Mezzanine equity:
Series C redeemable preferred stock, $0.001 par value; 18,820 shares authorized; 2,833 and 11,757 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	0	0
Embedded Derivative Financial Instruments, Convertible Promissory Note [Member]
Current liabilities:
Derivative liability	0	299
Warrant Liability [Member]
Current liabilities:
Derivative liability	162	305
ELOC Purchase Agreement [Member]
Current liabilities:
Convertible notes payable, current	0	328
March 2025 Senior Secured Notes [Member]
Current liabilities:
Senior secured notes payable	$ 374	$ 0