Note 1 - Company Overview (Details Textual) $ in Thousands		3 Months Ended
	May 14, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Net Income (Loss) Attributable to Parent			$ (3,896)	$ (5,162)
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation			(3,868)	(6)
Cash and Cash Equivalent			14,337	$ 17,545
Retained Earnings (Accumulated Deficit)			$ (715,573)		$ (711,677)
Subsequent Event [Member] | Minimum [Member]
Restructuring and Related Cost, Annualized Savings Generated	$ 5,000
Subsequent Event [Member] | Maximum [Member]
Restructuring and Related Cost, Annualized Savings Generated	$ 6,000
Employee Severance [Member] | Subsequent Event [Member]
Restructuring and Related Cost, Number of Positions Eliminated	20
Restructuring Charges		$ 2,300