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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Feb. 18, 2021
Share-Based Payment Arrangement, Expense | $ 1.8 | $ 1.5 | $ 4.3 | $ 4.8 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 8.4 |  | $ 8.4 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 9 months 18 days |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  | 737,258 | 574,251 |
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  | $ 3.7 | $ 4.5 |
Shares Withheld for Tax Withholding Obligation, Price Per Share (in dollars per share) | $ 4.99 | $ 7.88 | $ 4.99 | $ 7.88 |
Stock Issued During Period, Shares, New Issues (in shares) | 1,176,861 |  | 1,176,861 |  |
At the market Offering [Member] |  |  |  |  |
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] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 1,176,861 |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 4.5 |  |
Payments of Stock Issuance Costs |  |  | $ 0.1 |  |

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