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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 |  |  |  |

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