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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 23, 2024
Aug. 01, 2024
Jan. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Mar. 31, 2024
Retained Earnings (Accumulated Deficit)       $ (1,061,830)     $ (1,066,658)
Cash, Cash Equivalents, and Marketable Securities       75,200      
Net Cash Provided by (Used in) Operating Activities       21,995 $ (97)    
Shelf Registration, Maximum Amount to be Sold     $ 250,000        
Shelf Registration, Amount Available for Future Offerings       $ 250,000      
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 1   $ 0.01     $ 0.01
Megatran [Member]              
Business Combination, Consideration Transferred   $ 61,400          
Business Combination, Maximum Adjustment Before Indebtedness   25,000          
Business Combination, Share Purchase Price Quotient Amount   31,400          
Business Combination, Potential Additional Cash Payment   $ 5,000          
Payment for Contingent Consideration Liability, Investing Activities $ 3,300     $ 3,278 $ (0) $ 3,300  
Business Combination, Contingent Consideration Arrangements, Remaining Obligation to Stockholders       $ 0   $ 0  
Public Offering 2024 [Member]              
Stock Issued During Period, Shares, New Issues (in shares)     6,210,000        
Shares Issued, Price Per Share (in dollars per share)     $ 11.25        
Proceeds from Issuance of Common Stock     $ 65,200