Note 1 - Company Overview (Details Textual) $ in Thousands		3 Months Ended		6 Months Ended
	May 14, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Net Income (Loss) Attributable to Parent		$ (4,860)	$ (3,629)	$ (8,756)	$ (8,791)
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation				(8,287)	2,896
Cash and Cash Equivalent		10,495	$ 20,328	10,495	$ 20,328
Retained Earnings (Accumulated Deficit)		(720,433)		(720,433)		$ (711,677)
Restructuring Charges		1,800		1,800
Minimum [Member]
Restructuring and Related Cost, Annualized Savings Generated	$ 5,000
Maximum [Member]
Restructuring and Related Cost, Annualized Savings Generated	$ 6,000
Sales and Distribution Expenses [Member]
Restructuring Charges		1,000		1,000
General and Administrative Expense [Member]
Restructuring Charges		800		800
Employee Severance [Member]
Restructuring and Related Cost, Number of Positions Eliminated	20
Restructuring Charges		1,800		$ 1,795
Employee Severance [Member] | Sales and Distribution Expenses [Member]
Restructuring Charges		1,000
Employee Severance [Member] | General and Administrative Expense [Member]
Restructuring Charges		$ 800