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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | May 21, 2025 | Dec. 31, 2024 | Feb. 18, 2021
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ 2,600 | $ 2,300 | $ 6,500 | $ 6,400 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 14,000 |  | $ 14,000 |  |  |  |
Stock issued to directors, shares (in shares) |  |  | 179,836 | 145,687 |  |  |
Stock-based compensation |  |  | $ 7,562 | $ 6,401 |  |  |
Common stock issued to directors |  |  | $ 1,034 | $ 770 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 6 months |  |  |  |
Stock Issued During Period Shares Compensation To Interim CEO |  | 20,840 |  | 31,671 |  |  |
Common stock issued as compensation to interim CEO |  | $ 127 |  | $ 182 |  |  |
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] |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | 6,950,792,000 |  | 35,959,328,000 |  |  |  |
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares) |  |  |  |  |  |  | 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 | $ 42,100 |  | $ 216,200 |  |  |  |
Payments of Stock Issuance Costs | 600 |  | 3,300 |  |  |  |
Redeemption of Senior Notes | $ 212,000 |  | $ 212,000 |  |  |  |

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