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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Aug. 01, 2024
Jan. 31, 2024
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Retained Earnings (Accumulated Deficit)     $ (1,069,182,000) $ (1,069,182,000)   $ (1,066,658,000)
Cash, Cash Equivalents, and Marketable Securities     93,500,000 93,500,000    
Net Cash Provided by (Used in) Operating Activities     $ (3,400,000) $ 3,409,000 $ (2,245,000)  
Shelf Registration, Maximum Amount to be Sold   $ 250,000,000        
Subsequent Event [Member]            
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 1          
Subsequent Event [Member] | Megatran [Member]            
Business Combination, Consideration Transferred $ 61,350,000          
Business Combination, Maximum Adjustment Before Indebtedness 25,000,000          
Business Combination, Share Purchase Price Quotient Amount 31,350,000          
Business Combination, Potential Additional Cash Payment $ 5,000,000          
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   $ 65,200,000