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Note 8 - Financing Activities (Details Textual) |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2026 USD ($) $ / shares shares | Oct. 16, 2025 USD ($) $ / shares shares | Mar. 31, 2026 USD ($) $ / shares shares | Mar. 31, 2025 USD ($) | Jan. 20, 2026 USD ($) | Dec. 31, 2025 USD ($) | Oct. 31, 2025 $ / shares shares | Oct. 15, 2025 $ / shares
Stock Issued In Connection with Exercise of Warrants, Value |  |  |  | $ 614,000 |  |  |  |
Proceeds from Issuance of Warrants |  |  | $ 25,001,000 | $ 0 |  |  |  |
Crypto Asset, Fair Value |  |  | $ 160,086 |  |  | $ 0 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  | $ 0.06 |  |  |  |  |
USDT Tokens [Member] |  |  |  |  |  |  |  |
Crypto Asset, Number of Units, Acquired | 35,000,000 |  |  |  |  |  |  |
USDS Tokens [Member] |  |  |  |  |  |  |  |
Crypto Asset, Number of Units, Acquired | 16,000,000 |  |  |  |  |  |  |
USDT and USDS Tokens [Member] |  |  |  |  |  |  |  |
Crypto Asset, Fair Value | $ 51,000,000 |  |  |  |  |  |  |
January 2026 SKY Tokens [Member] |  |  |  |  |  |  |  |
Crypto Asset, Number of Units, Acquired | 943,599,689 |  |  |  |  |  |  |
Crypto Asset, Fair Value | $ 58,000,000 |  |  |  |  |  |  |
The January 2026 Warrants [Member] |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Shares | shares | 167,539,227 |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Value | $ 134,000,000 |  |  |  |  |  |  |
Class of Warrant or Right, Purchase Price of Warrants or Rights | $ / shares | $ 0.8 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 0.05 |  | 0.05 |  |  |  |  |
Warrants Exercisable at Six Months, Percentage | 20.00% |  |  |  |  |  |  |
Warrants Exercisable at Ninth Months, Percentage | 30.00% |  |  |  |  |  |  |
Warrants Exercisable at Twelve Months, Percentage | 50.00% |  |  |  |  |  |  |
October 2025 Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Shares | shares |  | 1,081,082 |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Value |  | $ 5,900,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 5.5 | $ 0.002385 |  |  |  | $ 0.002385 | $ 0.05
Maximum Percentage of Common Stock Outstanding |  | 9.90% |  |  |  |  |  |
Percent of Closing Price |  | 110.00% |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  |  | 22,664,040 |
At the Market Offering Agreement [Member] |  |  |  |  |  |  |  |
Equity Issuable, Maximum Offering Price |  |  |  |  | $ 100,000,000 |  |  |
Comission, Percent |  |  |  |  | 2.00% |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  | 1,434,919 |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 13,700,000 |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Net |  |  | 13,400,000 |  |  |  |  |
Payments of Stock Issuance Costs |  |  | 300,000 |  |  |  |  |
Common Stock Available for Issuance |  |  | $ 86,300,000 |  |  |  |  |
January 2026 Private Placement [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance of Warrants | $ 25,000,000 |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding | 4.99% |  |  |  |  |  |  |
January 2026 Private Placement [Member] | Election of the holder prior to the date of issuance [Member] |  |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding | 9.99% |  |  |  |  |  |  |

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