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Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Feb. 27, 2025 | Mar. 31, 2024
Share Repurchase Program [Member] |  |  |  |  |
Share Repurchase Program, Authorized, Amount |  |  | $ 90.7 | $ 90.3 |
Stock Repurchased and Retired During Period, Shares (in shares) |  | 910,481 | 1,384,186 |  |
Stock Repurchased and Retired During Period, Value |  | $ 39.3 | $ 90.7 |  |
Share Repurchase Program, Excise Tax, Percent |  | 1.00% | 1.00% |  |
Share Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |
Share Repurchase Program, Excise Tax, Percent | 1.00% |  |  |  |
Stock Repurchased During Period, Shares (in shares) | 1,379,723 |  |  |  |
Stock Repurchased During Period, Value | $ 50.8 |  |  |  |
Out-of-the-money Warrants [Member] |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 782,993
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 861,292
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  | 1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 100

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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