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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | May 21, 2025 | Dec. 31, 2024 | Feb. 18, 2021
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ 3,000 | $ 3,000 | $ 4,900 | $ 4,100 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 16,100 |  | $ 16,100 |  |  |  |
Stock issued to directors, shares (in shares) | 179,836 | 145,687 | 179,836 | 145,687 |  |  |
Stock-based compensation |  |  | $ 4,923 | $ 4,146 |  |  |
Common stock issued to directors | $ 1,034 | $ 770 | $ 1,034 | $ 770 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 7 months 6 days |  |  |  |
Stock Issued During Period Shares Compensation To Interim CEO |  | 10,831 |  | 10,831 |  |  |
Common stock issued as compensation to interim CEO |  | $ 55 |  | $ 55 |  |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  | 151,976 | 277,966 |  |  |
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  | $ 900 | $ 1,200 |  |  |
Shares Withheld for Tax Withholding Obligation, Price Per Share (in dollars per share) | $ 5.82 | $ 4.31 | $ 5.82 | $ 4.31 |  |  |
Common stock, shares authorized (in shares) | 1,250,000,000 |  | 1,250,000,000 |  |  | 1,250,000,000 |
Dividend per share | $ 0.00375 |  | $ 0.00375 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 1,250,000,000 |  |
Minimum [Member] |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 750,000,000 |  |
At the market Offering [Member] |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares) | 29,008,536 |  | 29,008,536 |  |  |  | 60,000,000
At the market Offering [Member] | At The Market Equity Distribution Agreement [Member] |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 174,100 |  |  |  |
Payments of Stock Issuance Costs |  |  | $ 2,700 |  |  |  |

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