Condensed Consolidated Statements of Stockholders' Equity (Current Period Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Preferred Stock [Member] Convertible Preferred Stock	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock, Common [Member]
Balance (in shares) at Dec. 31, 2023		125,304,064	582
Balance at Dec. 31, 2023	$ 91,016	$ 22,792	$ 0	$ 255,987	$ (186,288)	$ (1,475)
Issuance of common stock upon warrant exercise	204	$ 37	0	167	0	0
Issuance of common stock upon warrant exercise, shares		203,750
Stock-based compensation	417	$ 0	0	417	0	0
Net loss	(5,878)	$ 0	$ 0	0	(5,878)	0
Balance (in shares) at Mar. 31, 2024		125,507,814	582
Balance at Mar. 31, 2024	85,759	$ 22,829	$ 0	256,571	(192,166)	(1,475)
Balance (in shares) at Dec. 31, 2023		125,304,064	582
Balance at Dec. 31, 2023	91,016	$ 22,792	$ 0	255,987	(186,288)	(1,475)
Balance (in shares) at Dec. 31, 2024		129,170,004	582
Balance at Dec. 31, 2024	71,477	$ 23,488	$ 0	261,256	(211,792)	(1,475)
Stock-based compensation	563	0	0	563	0	0
Net loss	(6,718)	$ 0	$ 0	0	(6,718)	0
Balance (in shares) at Mar. 31, 2025		129,170,004	582
Balance at Mar. 31, 2025	$ 65,322	$ 23,488	$ 0	$ 261,819	$ (218,510)	$ (1,475)