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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Feb. 18, 2021
Subsidiary or Equity Method Investee [Line Items] |  |  |
Share-Based Payment Arrangement, Expense | $ 1,200 | $ 1,200 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 5,200 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 3 months 18 days |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) | 277,966 |  |
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation | $ 1,200 |  |
Shares Withheld for Tax Withholding Obligation, Price Per Share (in dollars per share) | $ 4.31 |  |
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares) | 14,753,958 |  |
Proceeds from Issuance or Sale of Equity | $ 1,100 |  |
Payments of Stock Issuance Costs | $ 40 |  |
Common stock issued under ATM program, net shares | 248,561 | 2,173,274,000 |
At the market Offering [Member] |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares) |  |  | 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 | $ 76,700 |  |
Payments of Stock Issuance Costs | $ 1,200 |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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